














                                  SURVEY CONTROL DATA
                                
                             STATE=TD
                             [MAY 10, 2024 21:14:5]
                              Version = 8.12.5.18
1    National Geodetic Survey, Retrieval Date = MAY 10, 2024 21:14:57 EDT
 AB9310 ***********************************************************************
 AB9310  DESIGNATION -  115
 AB9310  PID         -  AB9310
 AB9310  STATE/COUNTY-  TD/COUNTY OF TRINIDAD AND TOBAGO
 AB9310  COUNTRY     -  TRINIDAD and TOBAGO
 AB9310  USGS QUAD   -  
 AB9310
 AB9310                         *CURRENT SURVEY CONTROL
 AB9310  ______________________________________________________________________
 AB9310* NAD 83(2011) POSITION- 10 05 51.32987(N) 061 39 27.20553(W)   NO CHECK
 AB9310* NAD 83(2011) ELLIP HT-    74.880 (meters)        (06/27/12)   NO CHECK
 AB9310* NAD 83(2011) EPOCH   -  2010.00
 AB9310* LMSL    ORTHO HEIGHT -   116.    (meters)      381.    (feet) GPS OBS
 AB9310  ______________________________________________________________________
 AB9310  LMSL orthometric height was determined with geoid model       EGM96
 AB9310  GEOID HEIGHT    -        -44.394 (meters)                     EGM96
 AB9310  GEOID HEIGHT    -        -44.048 (meters)                     EGM08
 AB9310  NAD 83(2011) X  -  2,981,399.079 (meters)                     COMP
 AB9310  NAD 83(2011) Y  - -5,527,246.298 (meters)                     COMP
 AB9310  NAD 83(2011) Z  -  1,110,890.507 (meters)                     COMP
 AB9310  LAPLACE CORR    -          0.98  (seconds)                    DCAR97
 AB9310
 AB9310  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AB9310  Standards:
 AB9310         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AB9310            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AB9310  -------------------------------------------------------------------
 AB9310  NETWORK   54.37  24.44           5.54  27.54  12.47      0.40144494
 AB9310  -------------------------------------------------------------------
 AB9310  Click here for local accuracies and other accuracy information.
 AB9310
 AB9310.The horizontal coordinates were established by GPS observations
 AB9310.and adjusted by the National Geodetic Survey in June 2012.
 AB9310
 AB9310.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AB9310.been affixed to the stable North American tectonic plate. See 
 AB9310.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AB9310
 AB9310.The horizontal coordinates are valid at the epoch date displayed above
 AB9310.which is a decimal equivalence of Year/Month/Day.
 AB9310
 AB9310.No horizontal observational check was made to the station.
 AB9310
 AB9310.The orthometric height was determined by GPS observations and a
 AB9310.high-resolution geoid model.
 AB9310
 AB9310.No vertical observational check was made to the station.
 AB9310
 AB9310.Significant digits in the geoid height do not necessarily reflect accuracy.
 AB9310
 AB9310.Click photographs - Photos may exist for this station.
 AB9310
 AB9310.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AB9310
 AB9310.The Laplace correction was computed from DCAR97 derived deflections.
 AB9310
 AB9310.The ellipsoidal height was determined by GPS observations
 AB9310.and is referenced to NAD 83.
 AB9310
 AB9310. The following values were computed from the NAD 83(2011) position.
 AB9310
 AB9310;                    North         East     Units Scale Factor Converg.
 AB9310;UTM  20      - 1,116,504.762   647,094.317   MT  0.99986774   +0 14 07.5
 AB9310
 AB9310!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AB9310!UTM  20      -   0.99998822  x   0.99986774  =   0.99985596
 AB9310
 AB9310_U.S. NATIONAL GRID SPATIAL ADDRESS: 20PPS4709416504(NAD 83)
 AB9310
 AB9310                          SUPERSEDED SURVEY CONTROL
 AB9310
 AB9310  NAD 83(2007)-  10 05 51.32908(N)    061 39 27.20494(W) AD(2002.00) 0
 AB9310  ELLIP H (02/10/07)   74.889  (m)                       GP(2002.00)    
 AB9310  NAD 83(1996)-  10 05 51.32819(N)    061 39 27.20857(W) AD(       ) 1
 AB9310  ELLIP H (12/09/96)   74.920  (m)                       GP(       ) 1 1
 AB9310
 AB9310.Superseded values are not recommended for survey control.
 AB9310
 AB9310.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AB9310.See file dsdata.pdf to determine how the superseded data were derived.
 AB9310
 AB9310_MARKER: Z = SEE DESCRIPTION
 AB9310_SETTING: 0 = UNSPECIFIED SETTING
 AB9310_MAGNETIC: N = NO MAGNETIC MATERIAL
 AB9310_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 AB9310_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AB9310+SATELLITE: SATELLITE OBSERVATIONS - 1996
 AB9310
 AB9310  HISTORY     - Date     Condition        Report By
 AB9310  HISTORY     - 1996     MONUMENTED       TDLAS
 AB9310
 AB9310                          STATION DESCRIPTION
 AB9310
 AB9310'DESCRIBED BY TRINIDAD DEPT OF LAND + SURVEY 1996 (AC)
 AB9310'ACQUIRED FROM GPS OBSERVATIONS. CONTACT LANDS AND SURVEYS DIVISION
 AB9310'PORT OF SPAIN TRINIDAD FOR ADDITIONAL INFORMATION.
1    National Geodetic Survey, Retrieval Date = MAY 10, 2024 21:14:57 EDT
 AB9313 ***********************************************************************
 AB9313  DESIGNATION -  A 1991
 AB9313  PID         -  AB9313
 AB9313  STATE/COUNTY-  TD/COUNTY OF TRINIDAD AND TOBAGO
 AB9313  COUNTRY     -  TRINIDAD and TOBAGO
 AB9313  USGS QUAD   -  
 AB9313
 AB9313                         *CURRENT SURVEY CONTROL
 AB9313  ______________________________________________________________________
 AB9313* NAD 83(2011) POSITION- 11 19 25.47328(N) 060 32 55.18460(W)   NO CHECK
 AB9313* NAD 83(2011) ELLIP HT-   -39.520 (meters)        (06/27/12)   NO CHECK
 AB9313* NAD 83(2011) EPOCH   -  2010.00
 AB9313* LMSL    ORTHO HEIGHT -     2.85  (meters)        9.4   (feet) LEVELING
 AB9313  ______________________________________________________________________
 AB9313  GEOID HEIGHT    -        -43.278 (meters)                     EGM08
 AB9313  NAD 83(2011) X  -  3,075,358.967 (meters)                     COMP
 AB9313  NAD 83(2011) Y  - -5,446,466.587 (meters)                     COMP
 AB9313  NAD 83(2011) Z  -  1,244,132.032 (meters)                     COMP
 AB9313  LAPLACE CORR    -         -2.22  (seconds)                    DCAR97
 AB9313  VERT ORDER      -  THIRD ?
 AB9313
 AB9313  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AB9313  Standards:
 AB9313         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AB9313            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AB9313  -------------------------------------------------------------------
 AB9313  NETWORK   10.86  18.70           2.35   5.36   9.54      0.26348299
 AB9313  -------------------------------------------------------------------
 AB9313  Click here for local accuracies and other accuracy information.
 AB9313
 AB9313.The horizontal coordinates were established by GPS observations
 AB9313.and adjusted by the National Geodetic Survey in June 2012.
 AB9313
 AB9313.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AB9313.been affixed to the stable North American tectonic plate. See 
 AB9313.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AB9313
 AB9313.The horizontal coordinates are valid at the epoch date displayed above
 AB9313.which is a decimal equivalence of Year/Month/Day.
 AB9313
 AB9313.No horizontal observational check was made to the station.
 AB9313
 AB9313.The orthometric height was determined by differential leveling.
 AB9313.The vertical network tie was performed by a horz. field party for horz.
 AB9313.obs reductions. Reset procedures were used to establish the elevation.
 AB9313
 AB9313.Significant digits in the geoid height do not necessarily reflect accuracy.
 AB9313
 AB9313.Click photographs - Photos may exist for this station.
 AB9313
 AB9313.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AB9313
 AB9313.The Laplace correction was computed from DCAR97 derived deflections.
 AB9313
 AB9313.The ellipsoidal height was determined by GPS observations
 AB9313.and is referenced to NAD 83.
 AB9313
 AB9313. The following values were computed from the NAD 83(2011) position.
 AB9313
 AB9313;                    North         East     Units Scale Factor Converg.
 AB9313;UTM  20      - 1,252,900.598   767,572.918   MT  1.00048593   +0 28 53.8
 AB9313
 AB9313!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AB9313!UTM  20      -   1.00000622  x   1.00048593  =   1.00049215
 AB9313
 AB9313_U.S. NATIONAL GRID SPATIAL ADDRESS: 20PQT6757252900(NAD 83)
 AB9313
 AB9313                          SUPERSEDED SURVEY CONTROL
 AB9313
 AB9313  NAD 83(2007)-  11 19 25.47227(N)    060 32 55.18951(W) AD(2002.00) 0
 AB9313  ELLIP H (02/10/07)  -39.511  (m)                       GP(2002.00)    
 AB9313  NAD 83(1996)-  11 19 25.47148(N)    060 32 55.19332(W) AD(       ) 1
 AB9313  ELLIP H (12/09/96)  -39.494  (m)                       GP(       ) 1 1
 AB9313
 AB9313.Superseded values are not recommended for survey control.
 AB9313
 AB9313.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AB9313.See file dsdata.pdf to determine how the superseded data were derived.
 AB9313
 AB9313_MARKER: DD = SURVEY DISK
 AB9313_SETTING: 32 = SET IN A RETAINING WALL OR CONCRETE LEDGE
 AB9313_SP_SET: CONCRETE SEAWALL
 AB9313_STAMPING: A 1991
 AB9313_MAGNETIC: N = NO MAGNETIC MATERIAL
 AB9313_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 AB9313_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AB9313+SATELLITE: SATELLITE OBSERVATIONS - March 15, 1996
 AB9313
 AB9313  HISTORY     - Date     Condition        Report By
 AB9313  HISTORY     - 1991     MONUMENTED       TLAS
 AB9313  HISTORY     - 19960315 GOOD             NGS
 AB9313
 AB9313                          STATION DESCRIPTION
 AB9313
 AB9313'DESCRIBED BY NATIONAL GEODETIC SURVEY 1996 (AJL)
 AB9313'THE STATION IS LOCATED NEAR THE NORTH SIDE OF THE ISLAND OF TOBAGO, IN
 AB9313'THE VILLAGE OF CHARLOTTEVILLE.  SET IN TOP OF A CONCRETE SEAWALL, NEAR
 AB9313'THE SOUTHEAST END OF A CONCRETE PIER.  NEAR THE NORTHEAST SIDE.
 AB9313'OWNERSHIP--PORT AUTHORITY OF TRINIDAD AND TOBAGO.  NOTE--TIDAL BENCH
 AB9313'MARK.  LOCATED 3.4 M (11.2 FT) NORTH-NORTHEAST OF THE PIER CENTER, 3.0
 AB9313'M (9.8 FT) WEST-NORTHWEST OF THE ROAD CENTER, 0.8 M (2.6 FT) SOUTHEAST
 AB9313'OF A UTILITY POLE WITH METER BASE, AND THE STATION IS ABOUT 0.1 M (0.3
 AB9313'FT) ABOVE THE ROAD LEVEL AND FLUSH WITH THE SEAWALL SURFACE.  BY R.G.
 AB9313'HAYES.
1    National Geodetic Survey, Retrieval Date = MAY 10, 2024 21:14:57 EDT
 AB9309 ***********************************************************************
 AB9309  DESIGNATION -  H.U.BM 002
 AB9309  PID         -  AB9309
 AB9309  STATE/COUNTY-  TD/COUNTY OF TRINIDAD AND TOBAGO
 AB9309  COUNTRY     -  TRINIDAD and TOBAGO
 AB9309  USGS QUAD   -  
 AB9309
 AB9309                         *CURRENT SURVEY CONTROL
 AB9309  ______________________________________________________________________
 AB9309* NAD 83(2011) POSITION- 10 38 56.06968(N) 061 30 51.48357(W)   NO CHECK
 AB9309* NAD 83(2011) ELLIP HT-   -37.987 (meters)        (06/27/12)   NO CHECK
 AB9309* NAD 83(2011) EPOCH   -  2010.00
 AB9309* LMSL    ORTHO HEIGHT -     1.38  (meters)        4.5   (feet) LEVELING
 AB9309  ______________________________________________________________________
 AB9309  GEOID HEIGHT    -        -41.452 (meters)                     EGM08
 AB9309  NAD 83(2011) X  -  2,989,919.590 (meters)                     COMP
 AB9309  NAD 83(2011) Y  - -5,510,026.121 (meters)                     COMP
 AB9309  NAD 83(2011) Z  -  1,170,854.719 (meters)                     COMP
 AB9309  LAPLACE CORR    -         -0.11  (seconds)                    DCAR97
 AB9309  VERT ORDER      -  THIRD ?
 AB9309
 AB9309  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AB9309  Standards:
 AB9309         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AB9309            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AB9309  -------------------------------------------------------------------
 AB9309  NETWORK    5.73   6.33           0.85   2.89   3.23     -0.12828471
 AB9309  -------------------------------------------------------------------
 AB9309  Click here for local accuracies and other accuracy information.
 AB9309
 AB9309.The horizontal coordinates were established by GPS observations
 AB9309.and adjusted by the National Geodetic Survey in June 2012.
 AB9309
 AB9309.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AB9309.been affixed to the stable North American tectonic plate. See 
 AB9309.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AB9309
 AB9309.The horizontal coordinates are valid at the epoch date displayed above
 AB9309.which is a decimal equivalence of Year/Month/Day.
 AB9309
 AB9309.No horizontal observational check was made to the station.
 AB9309
 AB9309.The orthometric height was determined by differential leveling.
 AB9309.The vertical network tie was performed by a horz. field party for horz.
 AB9309.obs reductions. Reset procedures were used to establish the elevation.
 AB9309
 AB9309.Significant digits in the geoid height do not necessarily reflect accuracy.
 AB9309
 AB9309.Click photographs - Photos may exist for this station.
 AB9309
 AB9309.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AB9309
 AB9309.The Laplace correction was computed from DCAR97 derived deflections.
 AB9309
 AB9309.The ellipsoidal height was determined by GPS observations
 AB9309.and is referenced to NAD 83.
 AB9309
 AB9309. The following values were computed from the NAD 83(2011) position.
 AB9309
 AB9309;                    North         East     Units Scale Factor Converg.
 AB9309;UTM  20      - 1,177,548.908   662,509.593   MT  0.99992678   +0 16 28.6
 AB9309
 AB9309!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AB9309!UTM  20      -   1.00000597  x   0.99992678  =   0.99993275
 AB9309
 AB9309_U.S. NATIONAL GRID SPATIAL ADDRESS: 20PPS6250977548(NAD 83)
 AB9309
 AB9309                          SUPERSEDED SURVEY CONTROL
 AB9309
 AB9309  NAD 83(2007)-  10 38 56.06888(N)    061 30 51.48297(W) AD(2002.00) 0
 AB9309  ELLIP H (02/10/07)  -37.979  (m)                       GP(2002.00)    
 AB9309  NAD 83(1996)-  10 38 56.06799(N)    061 30 51.48661(W) AD(       ) 1
 AB9309  ELLIP H (12/09/96)  -37.949  (m)                       GP(       ) 1 1
 AB9309
 AB9309.Superseded values are not recommended for survey control.
 AB9309
 AB9309.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AB9309.See file dsdata.pdf to determine how the superseded data were derived.
 AB9309
 AB9309_MARKER: DJ = TIDAL STATION DISK
 AB9309_SETTING: 37 = SET IN A MASSIVE RETAINING WALL
 AB9309_SP_SET: TOP OF A SEAWALL
 AB9309_STAMPING: H.U.BM L S 002
 AB9309_MARK LOGO: TDLAS
 AB9309_MAGNETIC: N = NO MAGNETIC MATERIAL
 AB9309_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 AB9309_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AB9309+SATELLITE: SATELLITE OBSERVATIONS - March 12, 1996
 AB9309
 AB9309  HISTORY     - Date     Condition        Report By
 AB9309  HISTORY     - UNK      MONUMENTED       TDLAS
 AB9309  HISTORY     - 19960312 GOOD             NGS
 AB9309
 AB9309                          STATION DESCRIPTION
 AB9309
 AB9309'DESCRIBED BY NATIONAL GEODETIC SURVEY 1996 (AJL)
 AB9309'THE STATION IS LOCATED ON THE ISLAND OF TRINIDAD, IN PORT OF SPAIN,
 AB9309'SET IN TOP OF A CONCRETE SEAWALL.  OWNERSHIP--PORT OF SPAIN PORT
 AB9309'AUTHORITY.  NOTE--THIS STATION IS A TIDAL BENCH MARK.  LOCATED ABOUT
 AB9309'0.32 KM (0.20 MI) SOUTH OF THE HOLIDAY INN, 0.16 KM (0.10 MI) WEST OF
 AB9309'THE (TWIN TOWERS) , 18.9 M (62.0 FT) SOUTHWEST OF THE MOST SOUTHEAST 1
 AB9309'OF 2 BULLARDS, 0.6 M (2.0 FT) EAST-NORTHEAST OF THE WEST-SOUTHWEST
 AB9309'EDGE OF THE SEAWALL.  BY R.G.  HAYES
1    National Geodetic Survey, Retrieval Date = MAY 10, 2024 21:14:57 EDT
 AB9308 ***********************************************************************
 AB9308  DESIGNATION -  SAVANNAH RM 210
 AB9308  PID         -  AB9308
 AB9308  STATE/COUNTY-  TD/COUNTY OF TRINIDAD AND TOBAGO
 AB9308  COUNTRY     -  TRINIDAD and TOBAGO
 AB9308  USGS QUAD   -  
 AB9308
 AB9308                         *CURRENT SURVEY CONTROL
 AB9308  ______________________________________________________________________
 AB9308* NAD 83(2011) POSITION- 10 40 07.94331(N) 061 30 45.35731(W)   ADJUSTED
 AB9308* NAD 83(2011) ELLIP HT-   -12.161 (meters)        (06/27/12)   ADJUSTED
 AB9308* NAD 83(2011) EPOCH   -  2010.00
 AB9308* LMSL    ORTHO HEIGHT -    27.16  (meters)       89.1   (feet) LEVELING
 AB9308  ______________________________________________________________________
 AB9308  GEOID HEIGHT    -        -41.342 (meters)                     EGM08
 AB9308  NAD 83(2011) X  -  2,989,900.526 (meters)                     COMP
 AB9308  NAD 83(2011) Y  - -5,509,600.617 (meters)                     COMP
 AB9308  NAD 83(2011) Z  -  1,173,029.746 (meters)                     COMP
 AB9308  LAPLACE CORR    -         -0.11  (seconds)                    DCAR97
 AB9308  VERT ORDER      -  THIRD ?
 AB9308
 AB9308  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AB9308  Standards:
 AB9308         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AB9308            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AB9308  -------------------------------------------------------------------
 AB9308  NETWORK    5.60   5.66           0.66   2.84   2.89     -0.10151990
 AB9308  -------------------------------------------------------------------
 AB9308  Click here for local accuracies and other accuracy information.
 AB9308
 AB9308.The horizontal coordinates were established by GPS observations
 AB9308.and adjusted by the National Geodetic Survey in June 2012.
 AB9308
 AB9308.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AB9308.been affixed to the stable North American tectonic plate. See 
 AB9308.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AB9308
 AB9308.The horizontal coordinates are valid at the epoch date displayed above
 AB9308.which is a decimal equivalence of Year/Month/Day.
 AB9308
 AB9308.The orthometric height was determined by differential leveling.
 AB9308.The vertical network tie was performed by a horz. field party for horz.
 AB9308.obs reductions. Reset procedures were used to establish the elevation.
 AB9308
 AB9308.Significant digits in the geoid height do not necessarily reflect accuracy.
 AB9308
 AB9308.Click photographs - Photos may exist for this station.
 AB9308
 AB9308.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AB9308
 AB9308.The Laplace correction was computed from DCAR97 derived deflections.
 AB9308
 AB9308.The ellipsoidal height was determined by GPS observations
 AB9308.and is referenced to NAD 83.
 AB9308
 AB9308. The following values were computed from the NAD 83(2011) position.
 AB9308
 AB9308;                    North         East     Units Scale Factor Converg.
 AB9308;UTM  20      - 1,179,757.978   662,685.168   MT  0.99992749   +0 16 31.5
 AB9308
 AB9308!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AB9308!UTM  20      -   1.00000191  x   0.99992749  =   0.99992940
 AB9308
 AB9308_U.S. NATIONAL GRID SPATIAL ADDRESS: 20PPS6268579757(NAD 83)
 AB9308
 AB9308                          SUPERSEDED SURVEY CONTROL
 AB9308
 AB9308  NAD 83(2007)-  10 40 07.94252(N)    061 30 45.35672(W) AD(2002.00) 0
 AB9308  ELLIP H (02/10/07)  -12.153  (m)                       GP(2002.00)    
 AB9308  NAD 83(1996)-  10 40 07.94163(N)    061 30 45.36035(W) AD(       ) 1
 AB9308  ELLIP H (12/09/96)  -12.129  (m)                       GP(       ) 1 1
 AB9308
 AB9308.Superseded values are not recommended for survey control.
 AB9308
 AB9308.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AB9308.See file dsdata.pdf to determine how the superseded data were derived.
 AB9308
 AB9308_MARKER: B = BOLT
 AB9308_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 AB9308_MAGNETIC: N = NO MAGNETIC MATERIAL
 AB9308_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AB9308+STABILITY: SURFACE MOTION
 AB9308_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AB9308+SATELLITE: SATELLITE OBSERVATIONS - March 12, 1996
 AB9308
 AB9308  HISTORY     - Date     Condition        Report By
 AB9308  HISTORY     - UNK      MONUMENTED       TDLAS
 AB9308  HISTORY     - 19960312 GOOD             NGS
 AB9308
 AB9308                          STATION DESCRIPTION
 AB9308
 AB9308'DESCRIBED BY NATIONAL GEODETIC SURVEY 1996 (AJL)
 AB9308'THE STATION IS LOCATED ON THE ISLAND OF TRINIDAD, IN QUEENS PARK
 AB9308'SAVANNAH, PORT OF SPAIN.  IN A LARGE PLAYING FIELD, ACROSS THE ROAD
 AB9308'FROM THE HILTON HOTEL, ABOUT 1.6 KM (1.00 MI) NORTH OF THE (TWIN
 AB9308'TOWERS) , APPROXIMATELY 200 M (656.2 FT) EAST-NORTHEAST OF A STONE
 AB9308'FENCE SURROUNDING A CEMETERY.  OWNERSHIP--PORT OF SPAIN PARK
 AB9308'AUTHORITY.  NOTE--BENCH MARK THE STATION IS A 1-INCH BRASS BOLT, SET
 AB9308'ABOUT 4-CM BELOW THE TOP CENTER OF A 2-FOOT SQUARE CONCRETE POST,
 AB9308'PROJECTING 15-CM ABOVE THE GROUND SURFACE.  BY R.G.  HAYES
1    National Geodetic Survey, Retrieval Date = MAY 10, 2024 21:14:57 EDT
 AB9312 ***********************************************************************
 AB9312  DESIGNATION -  SCARBOROUGH TIDAL BENCH MARK
 AB9312  PID         -  AB9312
 AB9312  STATE/COUNTY-  TD/COUNTY OF TRINIDAD AND TOBAGO
 AB9312  COUNTRY     -  TRINIDAD and TOBAGO
 AB9312  USGS QUAD   -  
 AB9312
 AB9312                         *CURRENT SURVEY CONTROL
 AB9312  ______________________________________________________________________
 AB9312* NAD 83(2011) POSITION- 11 10 46.35737(N) 060 44 04.86540(W)   ADJUSTED
 AB9312* NAD 83(2011) ELLIP HT-   -38.153 (meters)        (06/27/12)   ADJUSTED
 AB9312* NAD 83(2011) EPOCH   -  2010.00
 AB9312* LMSL    ORTHO HEIGHT -     2.44  (meters)        8.0   (feet) LEVELING
 AB9312  ______________________________________________________________________
 AB9312  GEOID HEIGHT    -        -42.062 (meters)                     EGM08
 AB9312  NAD 83(2011) X  -  3,059,181.827 (meters)                     COMP
 AB9312  NAD 83(2011) Y  - -5,459,138.852 (meters)                     COMP
 AB9312  NAD 83(2011) Z  -  1,228,488.195 (meters)                     COMP
 AB9312  LAPLACE CORR    -         -1.14  (seconds)                    DCAR97
 AB9312  VERT ORDER      -  THIRD ?
 AB9312
 AB9312  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AB9312  Standards:
 AB9312         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AB9312            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AB9312  -------------------------------------------------------------------
 AB9312  NETWORK    9.68   9.78           1.10   4.91   4.99      0.04863107
 AB9312  -------------------------------------------------------------------
 AB9312  Click here for local accuracies and other accuracy information.
 AB9312
 AB9312.The horizontal coordinates were established by GPS observations
 AB9312.and adjusted by the National Geodetic Survey in June 2012.
 AB9312
 AB9312.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AB9312.been affixed to the stable North American tectonic plate. See 
 AB9312.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AB9312
 AB9312.The horizontal coordinates are valid at the epoch date displayed above
 AB9312.which is a decimal equivalence of Year/Month/Day.
 AB9312
 AB9312.The orthometric height was determined by differential leveling.
 AB9312.The vertical network tie was performed by a horz. field party for horz.
 AB9312.obs reductions. Reset procedures were used to establish the elevation.
 AB9312
 AB9312.Significant digits in the geoid height do not necessarily reflect accuracy.
 AB9312
 AB9312.Click photographs - Photos may exist for this station.
 AB9312
 AB9312.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AB9312
 AB9312.The Laplace correction was computed from DCAR97 derived deflections.
 AB9312
 AB9312.The ellipsoidal height was determined by GPS observations
 AB9312.and is referenced to NAD 83.
 AB9312
 AB9312. The following values were computed from the NAD 83(2011) position.
 AB9312
 AB9312;                    North         East     Units Scale Factor Converg.
 AB9312;UTM  20      - 1,236,780.316   747,380.772   MT  1.00035726   +0 26 22.0
 AB9312
 AB9312!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AB9312!UTM  20      -   1.00000600  x   1.00035726  =   1.00036326
 AB9312
 AB9312_U.S. NATIONAL GRID SPATIAL ADDRESS: 20PQT4738036780(NAD 83)
 AB9312
 AB9312                          SUPERSEDED SURVEY CONTROL
 AB9312
 AB9312  NAD 83(2007)-  11 10 46.35656(N)    060 44 04.86482(W) AD(2002.00) 0
 AB9312  ELLIP H (02/10/07)  -38.145  (m)                       GP(2002.00)    
 AB9312  NAD 83(1996)-  11 10 46.35567(N)    060 44 04.86832(W) AD(       ) 1
 AB9312  ELLIP H (12/09/96)  -38.124  (m)                       GP(       ) 1 1
 AB9312
 AB9312.Superseded values are not recommended for survey control.
 AB9312
 AB9312.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AB9312.See file dsdata.pdf to determine how the superseded data were derived.
 AB9312
 AB9312_MARKER: Z = SEE DESCRIPTION
 AB9312_SETTING: 32 = SET IN A RETAINING WALL OR CONCRETE LEDGE
 AB9312_SP_SET: CONCRETE SEAWALL
 AB9312_MAGNETIC: N = NO MAGNETIC MATERIAL
 AB9312_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AB9312+STABILITY: SURFACE MOTION
 AB9312_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AB9312+SATELLITE: SATELLITE OBSERVATIONS - March 14, 1996
 AB9312
 AB9312  HISTORY     - Date     Condition        Report By
 AB9312  HISTORY     - UNK      MONUMENTED       TNM
 AB9312  HISTORY     - 19960314 GOOD             NGS
 AB9312
 AB9312                          STATION DESCRIPTION
 AB9312
 AB9312'DESCRIBED BY NATIONAL GEODETIC SURVEY 1996 (AJL)
 AB9312'THE STATION IS LOCATED NEAR THE SOUTHWEST END OF THE ISLAND OF TOBAGO,
 AB9312'AT THE SEAPORT IN SCARBOROUGH, NEAR THE END OF THE COAST GUARD ROAD.
 AB9312'THE STATION IS ADJACENT TO A CONCRETE PIER UPON WHICH THE SCARBOROUGH
 AB9312'TIDE GUAGE IS LOCATED.  OWNERSHIP--TRINIDAD AND TOBAGO PORT AUTHORITY.
 AB9312'NOTE--TIDAL BENCH MARK.  THE STATION IS A STEEL BULLARD, APPROXIMATELY
 AB9312'0.3 M (1.0 FT) IN DIAMETER, SET IN A CONCRETE SEAWALL, AND PROJECTING
 AB9312'0.45 M (1.48 FT) , THE DATUM POINT IS THE TOP CENTER OF THE BULLARD,
 AB9312'THE BULLARD IS ABOUT 0.91 M (2.99 FT) FROM THE EDGE OF THE CONCRETE
 AB9312'PIER AND IS THE ONLY ONE THERE.
1    National Geodetic Survey, Retrieval Date = MAY 10, 2024 21:14:57 EDT
 AB9536 ***********************************************************************
 AB9536  DESIGNATION -  TTCP A
 AB9536  PID         -  AB9536
 AB9536  STATE/COUNTY-  TD/COUNTY OF TRINIDAD AND TOBAGO
 AB9536  COUNTRY     -  TRINIDAD and TOBAGO
 AB9536  USGS QUAD   -  
 AB9536
 AB9536                         *CURRENT SURVEY CONTROL
 AB9536  ______________________________________________________________________
 AB9536* NAD 83(1996) POSITION- 11 08 59.91822(N) 060 50 34.67448(W)   ADJUSTED
 AB9536* NAD 83(1996) ELLIP HT-   -31.092 (meters)        (01/06/97)   ADJUSTED
 AB9536* LMSL    ORTHO HEIGHT -     8.4   (meters)       28.    (feet) GPS OBS
 AB9536  ______________________________________________________________________
 AB9536  LMSL orthometric height was determined with geoid model       EGM96
 AB9536  GEOID HEIGHT    -        -42.055 (meters)                     EGM96
 AB9536  GEOID HEIGHT    -        -41.779 (meters)                     EGM08
 AB9536  NAD 83(1996) X  -  3,049,171.337 (meters)                     COMP
 AB9536  NAD 83(1996) Y  - -5,465,469.564 (meters)                     COMP
 AB9536  NAD 83(1996) Z  -  1,225,280.959 (meters)                     COMP
 AB9536  LAPLACE CORR    -         -0.65  (seconds)                    DCAR97
 AB9536  HORZ ORDER      -  FIRST
 AB9536  ELLP ORDER      -  THIRD     CLASS II
 AB9536
 AB9536.The horizontal coordinates were established by GPS observations
 AB9536.and adjusted by the National Geodetic Survey in January 1997.
 AB9536
 AB9536.The orthometric height was determined by GPS observations and a
 AB9536.high-resolution geoid model.
 AB9536
 AB9536.Significant digits in the geoid height do not necessarily reflect accuracy.
 AB9536
 AB9536.Click photographs - Photos may exist for this station.
 AB9536
 AB9536.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AB9536
 AB9536.The Laplace correction was computed from DCAR97 derived deflections.
 AB9536
 AB9536.The ellipsoidal height was determined by GPS observations
 AB9536.and is referenced to NAD 83.
 AB9536
 AB9536. The following values were computed from the NAD 83(1996) position.
 AB9536
 AB9536;                    North         East     Units Scale Factor Converg.
 AB9536;UTM  20      - 1,233,420.386   735,574.688   MT  1.00028669   +0 25 02.3
 AB9536
 AB9536!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AB9536!UTM  20      -   1.00000489  x   1.00028669  =   1.00029158
 AB9536
 AB9536:                Primary Azimuth Mark                     Grid Az
 AB9536:UTM  20      -  TTCP B                                   086 22 13.6
 AB9536
 AB9536_U.S. NATIONAL GRID SPATIAL ADDRESS: 20PQT3557433420(NAD 83)
 AB9536
 AB9536|---------------------------------------------------------------------|
 AB9536| PID    Reference Object                     Distance      Geod. Az  |
 AB9536|                                                           dddmmss.s |
 AB9536| AB9311 TTCP B                              APPROX. 1.2 KM 0864715.9 |
 AB9536|---------------------------------------------------------------------|
 AB9536
 AB9536                          SUPERSEDED SURVEY CONTROL
 AB9536
 AB9536.No superseded survey control is available for this station.
 AB9536
 AB9536_MARKER: DH = HORIZONTAL CONTROL DISK
 AB9536_SETTING: 41 = SET IN A LARGE STRUCTURE WITH FOUNDATIONS ON BEDROCK
 AB9536_SP_SET: 6X6X6-FT VASI LT BASE ON BEDROCK
 AB9536_STAMPING: TTCP A 1996
 AB9536_MARK LOGO: NGS
 AB9536_MAGNETIC: N = NO MAGNETIC MATERIAL
 AB9536_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 AB9536+STABILITY: POSITION/ELEVATION WELL
 AB9536_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AB9536+SATELLITE: SATELLITE OBSERVATIONS - 1996
 AB9536
 AB9536  HISTORY     - Date     Condition        Report By
 AB9536  HISTORY     - 1996     MONUMENTED       NGS
 AB9536
 AB9536                          STATION DESCRIPTION
 AB9536
 AB9536'DESCRIBED BY NATIONAL GEODETIC SURVEY 1996 (AJL)
 AB9536'THE STATION IS LOCATED ON THE SOUTHWEST END OF THE ISLAND OF TOBAGO,
 AB9536'AT THE CROWN POINT INTERNATIONAL AIRPORT.  NEAR THE WEST END OF THE
 AB9536'AIRPORT, IN THE LAST GRASS MEDIAN SOUTH OF RUNWAY END 11, WEST OF A
 AB9536'SERVICE ROAD LEADING TO A GATE SOUTH OF THE RUNWAY, SET IN TOP OF AND
 AB9536'0.3 M (1.0 FT) NORTHEAST OF THE SOUTHWEST CORNER OF THE SOUTHERN MOST
 AB9536'1 OF 3, 6 X 6 X 6-FOOT DEEP ABANDONED VASI LIGHT BASES.
 AB9536'OWNERSHIP--AIRPORTS AUTHORITY OF TRINIDAD AND TOBAGO, AIRPORTS
 AB9536'ADMINISTRATION OFFICE, CROWN POINT AIRPORT, CROWN POINT, P.O.  BOX 315
 AB9536'TOBAGO, W.I.  AIRPORT MANAGER 1 ROSALIND CHINNIA RAMADEEN, PHONE
 AB9536'809-639-8547.  FAX 809-639-8146.  NOTE--CONTACT AIRPORT MANAGER ON
 AB9536'ARRIVAL.  NOTE--THIS STATION WAS SELECTED AS A (SACS) .  LOCATED 62.6
 AB9536'M (205.4 FT) WEST OF THE SERVICE ROAD CENTER, 52.4 M (171.9 FT) SOUTH
 AB9536'OF THE RUNWAY CENTERLINE, 47.2 M (154.9 FT) NORTH OF THE CHAIN LINK
 AB9536'PERIMETER FENCE, AND THE STATION IS ABOUT 0.3 M (1.0 FT) BELOW THE
 AB9536'LEVEL OF THE RUNWAY AND PROJECTING 0.3 M (1.0 FT) ABOVE THE GROUND
 AB9536'SURFACE.  BY R.G.  HAYES
1    National Geodetic Survey, Retrieval Date = MAY 10, 2024 21:14:57 EDT
 AB9311 ***********************************************************************
 AB9311  DESIGNATION -  TTCP B
 AB9311  PID         -  AB9311
 AB9311  STATE/COUNTY-  TD/COUNTY OF TRINIDAD AND TOBAGO
 AB9311  COUNTRY     -  TRINIDAD and TOBAGO
 AB9311  USGS QUAD   -  
 AB9311
 AB9311                         *CURRENT SURVEY CONTROL
 AB9311  ______________________________________________________________________
 AB9311* NAD 83(2011) POSITION- 11 09 02.06870(N) 060 49 55.85907(W)   ADJUSTED
 AB9311* NAD 83(2011) ELLIP HT-   -29.152 (meters)        (06/27/12)   ADJUSTED
 AB9311* NAD 83(2011) EPOCH   -  2010.00
 AB9311* LMSL    ORTHO HEIGHT -    10.4   (meters)       34.    (feet) GPS OBS
 AB9311  ______________________________________________________________________
 AB9311  LMSL orthometric height was determined with geoid model       EGM96
 AB9311  GEOID HEIGHT    -        -42.087 (meters)                     EGM96
 AB9311  GEOID HEIGHT    -        -41.800 (meters)                     EGM08
 AB9311  NAD 83(2011) X  -  3,050,194.488 (meters)                     COMP
 AB9311  NAD 83(2011) Y  - -5,464,886.171 (meters)                     COMP
 AB9311  NAD 83(2011) Z  -  1,225,346.163 (meters)                     COMP
 AB9311  LAPLACE CORR    -         -0.65  (seconds)                    DCAR97
 AB9311
 AB9311  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AB9311  Standards:
 AB9311         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AB9311            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AB9311  -------------------------------------------------------------------
 AB9311  NETWORK    9.05   5.80           0.76   4.60   2.96     -0.11432725
 AB9311  -------------------------------------------------------------------
 AB9311  Click here for local accuracies and other accuracy information.
 AB9311
 AB9311.The horizontal coordinates were established by GPS observations
 AB9311.and adjusted by the National Geodetic Survey in June 2012.
 AB9311
 AB9311.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AB9311.been affixed to the stable North American tectonic plate. See 
 AB9311.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AB9311
 AB9311.The horizontal coordinates are valid at the epoch date displayed above
 AB9311.which is a decimal equivalence of Year/Month/Day.
 AB9311
 AB9311.The orthometric height was determined by GPS observations and a
 AB9311.high-resolution geoid model.
 AB9311
 AB9311.Significant digits in the geoid height do not necessarily reflect accuracy.
 AB9311
 AB9311.Click photographs - Photos may exist for this station.
 AB9311
 AB9311.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AB9311
 AB9311.The Laplace correction was computed from DCAR97 derived deflections.
 AB9311
 AB9311.The ellipsoidal height was determined by GPS observations
 AB9311.and is referenced to NAD 83.
 AB9311
 AB9311. The following values were computed from the NAD 83(2011) position.
 AB9311
 AB9311;                    North         East     Units Scale Factor Converg.
 AB9311;UTM  20      - 1,233,495.083   736,752.260   MT  1.00029358   +0 25 09.9
 AB9311
 AB9311!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AB9311!UTM  20      -   1.00000458  x   1.00029358  =   1.00029817
 AB9311
 AB9311:                Primary Azimuth Mark                     Grid Az
 AB9311:UTM  20      -  TTCP C                                   095 47 47.1
 AB9311
 AB9311_U.S. NATIONAL GRID SPATIAL ADDRESS: 20PQT3675233495(NAD 83)
 AB9311
 AB9311|---------------------------------------------------------------------|
 AB9311| PID    Reference Object                     Distance      Geod. Az  |
 AB9311|                                                           dddmmss.s |
 AB9311| AB9535 TTCP C                              APPROX. 0.7 KM 0961257.0 |
 AB9311| AB9536 TTCP A                              APPROX. 1.2 KM 2664723.5 |
 AB9311|---------------------------------------------------------------------|
 AB9311
 AB9311                          SUPERSEDED SURVEY CONTROL
 AB9311
 AB9311  NAD 83(2007)-  11 09 02.06788(N)    060 49 55.85849(W) AD(2002.00) 0
 AB9311  ELLIP H (02/10/07)  -29.145  (m)                       GP(2002.00)    
 AB9311  NAD 83(1996)-  11 09 02.06701(N)    060 49 55.86195(W) AD(       ) A
 AB9311  ELLIP H (12/09/96)  -29.128  (m)                       GP(       ) 1 1
 AB9311
 AB9311.Superseded values are not recommended for survey control.
 AB9311
 AB9311.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AB9311.See file dsdata.pdf to determine how the superseded data were derived.
 AB9311
 AB9311_MARKER: DH = HORIZONTAL CONTROL DISK
 AB9311_SETTING: 41 = SET IN A LARGE STRUCTURE WITH FOUNDATIONS ON BEDROCK
 AB9311_SP_SET: 3X4X400-FT CONCRETE DRAIN DITCH
 AB9311_STAMPING: TTCP B 1996
 AB9311_MARK LOGO: NGS
 AB9311_MAGNETIC: N = NO MAGNETIC MATERIAL
 AB9311_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 AB9311+STABILITY: POSITION/ELEVATION WELL
 AB9311_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AB9311+SATELLITE: SATELLITE OBSERVATIONS - 1996
 AB9311
 AB9311  HISTORY     - Date     Condition        Report By
 AB9311  HISTORY     - 1996     MONUMENTED       NGS
 AB9311
 AB9311                          STATION DESCRIPTION
 AB9311
 AB9311'DESCRIBED BY NATIONAL GEODETIC SURVEY 1996 (AJL)
 AB9311'THE STATION IS LOCATED ON THE SOUTHWEST END OF THE ISLAND OF TOBAGO,
 AB9311'AT THE CROWN POINT INTERNATIONAL AIRPORT.  NEAR THE CENTER OF THE
 AB9311'AIRPORT, SOUTH OF AND IN LINE WITH THE WEST EDGE OF THE CONTROL TOWER
 AB9311'AT THE FIRE STATION, ABOUT HALFWAY BETWEEN THE RUNWAY AND THE
 AB9311'PERIMETER ROAD, SET IN TOP OF THE WEST WALL OF A 3-FOOT WIDE BY 4-FOOT
 AB9311'DEEP BY 400-FOOT LONG CONCRETE DRAINAGE DITCH (UNCOVERED SECTION) ,
 AB9311'RUNNING NORTH AND SOUTH BETWEEN THE RUNWAY AND THE PERIMETER ROAD.
 AB9311'OWNERSHIP--AIRPORTS AUTHORITY OF TRINIDAD AND TOBAGO, AIRPORTS
 AB9311'ADMINISTRATION OFFICE, CROWN POINT AIRPORT, CROWN POINT, P.O.  BOX 315
 AB9311'TOBAGO, W.I.  AIRPORT MANAGER 1 ROSALIND CHINNIA RAMADEEN, PHONE
 AB9311'809-639-8547.  FAX 809-639-8146.  NOTE--CONTACT AIRPORT MANAGER ON
 AB9311'ARRIVAL.  NOTE--THIS STATION WAS SELECTED AS A (PACS) .  LOCATED 99.6
 AB9311'M (326.8 FT) NORTH OF THE RUNWAY CENTERLINE, 51.5 M (169.0 FT) SOUTH
 AB9311'OF THE PERIMETER ROAD CENTER, 25.4 M (83.3 FT) WEST OF THE FIRE
 AB9311'STATION/RUNWAY ACCESS ROAD CENTER, AND THE STATION IS ABOUT LEVEL WITH
 AB9311'THE PERIMETER ROAD AND FLUSH WITH THE GROUND SURFACE.  BY R.G.  HAYES
1    National Geodetic Survey, Retrieval Date = MAY 10, 2024 21:14:57 EDT
 AB9535 ***********************************************************************
 AB9535  DESIGNATION -  TTCP C
 AB9535  PID         -  AB9535
 AB9535  STATE/COUNTY-  TD/COUNTY OF TRINIDAD AND TOBAGO
 AB9535  COUNTRY     -  TRINIDAD and TOBAGO
 AB9535  USGS QUAD   -  
 AB9535
 AB9535                         *CURRENT SURVEY CONTROL
 AB9535  ______________________________________________________________________
 AB9535* NAD 83(1996) POSITION- 11 08 59.43726(N) 060 49 31.39492(W)   ADJUSTED
 AB9535* NAD 83(1996) ELLIP HT-   -29.357 (meters)        (01/06/97)   ADJUSTED
 AB9535* LMSL    ORTHO HEIGHT -    10.2   (meters)       33.    (feet) GPS OBS
 AB9535  ______________________________________________________________________
 AB9535  LMSL orthometric height was determined with geoid model       EGM96
 AB9535  GEOID HEIGHT    -        -42.109 (meters)                     EGM96
 AB9535  GEOID HEIGHT    -        -41.815 (meters)                     EGM08
 AB9535  NAD 83(1996) X  -  3,050,850.156 (meters)                     COMP
 AB9535  NAD 83(1996) Y  - -5,464,537.840 (meters)                     COMP
 AB9535  NAD 83(1996) Z  -  1,225,266.795 (meters)                     COMP
 AB9535  LAPLACE CORR    -         -0.68  (seconds)                    DCAR97
 AB9535  HORZ ORDER      -  FIRST
 AB9535  ELLP ORDER      -  THIRD     CLASS II
 AB9535
 AB9535.The horizontal coordinates were established by GPS observations
 AB9535.and adjusted by the National Geodetic Survey in January 1997.
 AB9535
 AB9535.The orthometric height was determined by GPS observations and a
 AB9535.high-resolution geoid model.
 AB9535
 AB9535.Significant digits in the geoid height do not necessarily reflect accuracy.
 AB9535
 AB9535.Click photographs - Photos may exist for this station.
 AB9535
 AB9535.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AB9535
 AB9535.The Laplace correction was computed from DCAR97 derived deflections.
 AB9535
 AB9535.The ellipsoidal height was determined by GPS observations
 AB9535.and is referenced to NAD 83.
 AB9535
 AB9535. The following values were computed from the NAD 83(1996) position.
 AB9535
 AB9535;                    North         East     Units Scale Factor Converg.
 AB9535;UTM  20      - 1,233,419.649   737,495.348   MT  1.00029794   +0 25 14.6
 AB9535
 AB9535!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AB9535!UTM  20      -   1.00000462  x   1.00029794  =   1.00030256
 AB9535
 AB9535:                Primary Azimuth Mark                     Grid Az
 AB9535:UTM  20      -  TTCP B                                   275 47 47.1
 AB9535
 AB9535_U.S. NATIONAL GRID SPATIAL ADDRESS: 20PQT3749533419(NAD 83)
 AB9535
 AB9535|---------------------------------------------------------------------|
 AB9535| PID    Reference Object                     Distance      Geod. Az  |
 AB9535|                                                           dddmmss.s |
 AB9535| AB9311 TTCP B                              APPROX. 0.7 KM 2761301.7 |
 AB9535|---------------------------------------------------------------------|
 AB9535
 AB9535                          SUPERSEDED SURVEY CONTROL
 AB9535
 AB9535.No superseded survey control is available for this station.
 AB9535
 AB9535_MARKER: DH = HORIZONTAL CONTROL DISK
 AB9535_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 AB9535_STAMPING: TTCP C 1996
 AB9535_MARK LOGO: NGS
 AB9535_MAGNETIC: N = NO MAGNETIC MATERIAL
 AB9535_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AB9535+STABILITY: SURFACE MOTION
 AB9535_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AB9535+SATELLITE: SATELLITE OBSERVATIONS - 1996
 AB9535
 AB9535  HISTORY     - Date     Condition        Report By
 AB9535  HISTORY     - 1996     MONUMENTED       NGS
 AB9535
 AB9535                          STATION DESCRIPTION
 AB9535
 AB9535'DESCRIBED BY NATIONAL GEODETIC SURVEY 1996 (AJL)
 AB9535'THE STATION IS LOCATED ON THE SOUTHWEST END OF THE ISLAND OF TOBAGO,
 AB9535'AT THE CROWN POINT INTERNATIONAL AIRPORT.  NEAR THE NORTHEAST END OF
 AB9535'THE AIRPORT, IN A GRASS AREA BETWEEN THE RUNWAY AND A CONCRETE
 AB9535'DRAINAGE DITCH NORTH OF THE RUNWAY, EAST OF A SOUTHEAST CORNER OF THE
 AB9535'PERIMETER FENCE, IN LINE WITH THE WEST END OF THE 2ND SET OF TOUCHDOWN
 AB9535'ZONE MARKERS WEST OF RUNWAY END 29.  OWNERSHIP--AIRPORTS AUTHORITY OF
 AB9535'TRINIDAD AND TOBAGO, AIRPORTS ADMINISTRATION OFFICE, CROWN POINT
 AB9535'AIRPORT, CROWN POINT, P.O.  BOX 315 TOBAGO, W.I.  AIRPORT MANAGER 1
 AB9535'ROSALIND CHINNIA RAMADEEN, PHONE 809-639-8547.  FAX 809-639-8146.
 AB9535'NOTE--CONTACT AIRPORT MANAGER ON ARRIVAL.  NOTE--THIS STATION WAS
 AB9535'SELECTED AS A (SACS) .  LOCATED 0.6 KM (0.35 MI) WEST OF THE EAST END
 AB9535'OF THE RUNWAY, 131.7 M (432.1 FT) EAST OF A SOUTHEAST CORNER OF THE
 AB9535'PERIMETER FENCE, 73.2 M (240.2 FT) NORTH OF THE RUNWAY CENTERLINE,
 AB9535'45.2 M (148.3 FT) SOUTH OF THE SOUTH WALL OF THE DRAINAGE DITCH, AND
 AB9535'THE MONUMENT IS ABOUT 0.4 M (1.3 FT) BELOW THE LEVEL OF THE RUNWAY AND
 AB9535'FLUSH WITH THE GROUND SURFACE.  BY R.G.  HAYES
1    National Geodetic Survey, Retrieval Date = MAY 10, 2024 21:14:57 EDT
 AB9307 ***********************************************************************
 AB9307  DESIGNATION -  TTPP A
 AB9307  PID         -  AB9307
 AB9307  STATE/COUNTY-  TD/COUNTY OF TRINIDAD AND TOBAGO
 AB9307  COUNTRY     -  TRINIDAD and TOBAGO
 AB9307  USGS QUAD   -  
 AB9307
 AB9307                         *CURRENT SURVEY CONTROL
 AB9307  ______________________________________________________________________
 AB9307* NAD 83(2011) POSITION- 10 35 39.14466(N) 061 20 50.60892(W)   ADJUSTED
 AB9307* NAD 83(2011) ELLIP HT-   -28.931 (meters)        (06/27/12)   ADJUSTED
 AB9307* NAD 83(2011) EPOCH   -  2010.00
 AB9307* LMSL    ORTHO HEIGHT -    10.5   (meters)       34.    (feet) GPS OBS
 AB9307  ______________________________________________________________________
 AB9307  LMSL orthometric height was determined with geoid model       EGM96
 AB9307  GEOID HEIGHT    -        -42.275 (meters)                     EGM96
 AB9307  GEOID HEIGHT    -        -41.734 (meters)                     EGM08
 AB9307  NAD 83(2011) X  -  3,006,497.292 (meters)                     COMP
 AB9307  NAD 83(2011) Y  - -5,502,279.245 (meters)                     COMP
 AB9307  NAD 83(2011) Z  -  1,164,909.460 (meters)                     COMP
 AB9307  LAPLACE CORR    -          0.02  (seconds)                    DCAR97
 AB9307
 AB9307  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AB9307  Standards:
 AB9307         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AB9307            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AB9307  -------------------------------------------------------------------
 AB9307  NETWORK    5.49   3.12           0.51   2.79   1.59     -0.13112902
 AB9307  -------------------------------------------------------------------
 AB9307  Click here for local accuracies and other accuracy information.
 AB9307
 AB9307.The horizontal coordinates were established by GPS observations
 AB9307.and adjusted by the National Geodetic Survey in June 2012.
 AB9307
 AB9307.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AB9307.been affixed to the stable North American tectonic plate. See 
 AB9307.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AB9307
 AB9307.The horizontal coordinates are valid at the epoch date displayed above
 AB9307.which is a decimal equivalence of Year/Month/Day.
 AB9307
 AB9307.The orthometric height was determined by GPS observations and a
 AB9307.high-resolution geoid model.
 AB9307
 AB9307.Significant digits in the geoid height do not necessarily reflect accuracy.
 AB9307
 AB9307.Click photographs - Photos may exist for this station.
 AB9307
 AB9307.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AB9307
 AB9307.The Laplace correction was computed from DCAR97 derived deflections.
 AB9307
 AB9307.The ellipsoidal height was determined by GPS observations
 AB9307.and is referenced to NAD 83.
 AB9307
 AB9307. The following values were computed from the NAD 83(2011) position.
 AB9307
 AB9307;                    North         East     Units Scale Factor Converg.
 AB9307;UTM  20      - 1,171,590.778   680,803.286   MT  1.00000450   +0 18 14.1
 AB9307
 AB9307!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AB9307!UTM  20      -   1.00000455  x   1.00000450  =   1.00000905
 AB9307
 AB9307:                Primary Azimuth Mark                     Grid Az
 AB9307:UTM  20      -  TTPP C                                   094 02 53.2
 AB9307
 AB9307_U.S. NATIONAL GRID SPATIAL ADDRESS: 20PPS8080371590(NAD 83)
 AB9307
 AB9307|---------------------------------------------------------------------|
 AB9307| PID    Reference Object                     Distance      Geod. Az  |
 AB9307|                                                           dddmmss.s |
 AB9307| AB9530 TTPP B                              335.342 METERS 08648     |
 AB9307| AB9529 TTPP C                              APPROX. 1.2 KM 0942107.3 |
 AB9307|---------------------------------------------------------------------|
 AB9307
 AB9307                          SUPERSEDED SURVEY CONTROL
 AB9307
 AB9307  NAD 83(2007)-  10 35 39.14386(N)    061 20 50.60832(W) AD(2002.00) 0
 AB9307  ELLIP H (02/10/07)  -28.922  (m)                       GP(2002.00)    
 AB9307  NAD 83(1996)-  10 35 39.14297(N)    061 20 50.61197(W) AD(       ) A
 AB9307  ELLIP H (12/09/96)  -28.893  (m)                       GP(       ) 1 1
 AB9307
 AB9307.Superseded values are not recommended for survey control.
 AB9307
 AB9307.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AB9307.See file dsdata.pdf to determine how the superseded data were derived.
 AB9307
 AB9307_MARKER: DH = HORIZONTAL CONTROL DISK
 AB9307_SETTING: 40 = SET IN A LARGE STRUCTURE WITH DEEP FOUNDATIONS
 AB9307_SP_SET: 15 X 20-FT CONCRETE FUELING PAD
 AB9307_STAMPING: TTPP A 1996
 AB9307_MARK LOGO: NGS
 AB9307_MAGNETIC: N = NO MAGNETIC MATERIAL
 AB9307_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 AB9307+STABILITY: POSITION/ELEVATION WELL
 AB9307_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AB9307+SATELLITE: SATELLITE OBSERVATIONS - 1996
 AB9307
 AB9307  HISTORY     - Date     Condition        Report By
 AB9307  HISTORY     - 1996     MONUMENTED       NGS
 AB9307
 AB9307                          STATION DESCRIPTION
 AB9307
 AB9307'DESCRIBED BY NATIONAL GEODETIC SURVEY 1996 (AJL)
 AB9307'THE STATION IS LOCATED ON THE ISLAND OF TRINIDAD, AT THE PIARCO
 AB9307'AIRPORT.  NEAR THE WEST END OF THE AIRPORT, APPROXIMATELY 269.0 M
 AB9307'(882.5 FT) WEST OF THE CENTRAL TAXI CENTERLINE, NEAR THE
 AB9307'NORTH-NORTHWEST EDGE OF AN ABANDONED RAMP/PARKING APRON, SET IN TOP OF
 AB9307'A DISCOLORED CONCRETE PAD (BLACK) , AND 0.7 M (2.3 FT) SOUTH OF THE
 AB9307'NORTH CORNER OF THE NORTH-NORTHWEST 1 OF 2 15 X 20 X 3-FOOT CONCRETE
 AB9307'PARKING PADS OF AN ABANDONED FUELING STATION. OWNERSHIP--AIRPORT
 AB9307'AUTHORITY OF TRINIDAD AND TOBAGO, AIRPORTS ADMINISTRATION CENTER,
 AB9307'CARONI NORTH BANK ROAD, PIARCO, TRINIDAD AND TOBAGO, P.O.  BOX 1273.
 AB9307'MANAGER AIRPORT OPERATIONS L.  ERIC PIERRE, PHONE 809-664-8047/9,
 AB9307'664-4101-3.  FAX 809-669-2319.  NOTE--CONTACT MANAGER AIRPORT
 AB9307'OPERATIONS ON ARRIVAL.  NOTE--THIS STATION WAS SELECTED AS A (PACS) .
 AB9307'LOCATION 41.7 M (136.8 FT) SOUTH-SOUTHEAST OF AN ABANDONED RUNWAY
 AB9307'CENTER NUMBER (04-22) , 34.9 M (114.5 FT) NORTH OF TAXI 10 SOUTH
 AB9307'CENTERLINE (MAIN TAXI) , 4.7 M (15.4 FT) EAST OF THE 16-INCH ROUND
 AB9307'CENTER CONCRETE BASE OF THE ABANDONED FUELING STATION, AND THE STATION
 AB9307'IS ABOUT 0.4 M (1.3 FT) BELOW THE LEVEL OF THE MAIN TAXI AND FLUSH
 AB9307'WITH THE ABANDONED TAXI SURFACE.  BY R.G.  HAYES
1    National Geodetic Survey, Retrieval Date = MAY 10, 2024 21:14:57 EDT
 AB9530 ***********************************************************************
 AB9530  DESIGNATION -  TTPP B
 AB9530  PID         -  AB9530
 AB9530  STATE/COUNTY-  TD/COUNTY OF TRINIDAD AND TOBAGO
 AB9530  COUNTRY     -  TRINIDAD and TOBAGO
 AB9530  USGS QUAD   -  
 AB9530
 AB9530                         *CURRENT SURVEY CONTROL
 AB9530  ______________________________________________________________________
 AB9530* NAD 83(1996) POSITION- 10 35 39.75309(N) 061 20 39.59451(W)   ADJUSTED
 AB9530* NAD 83(1996) ELLIP HT-   -29.074 (meters)        (01/02/97)   ADJUSTED
 AB9530* LMSL    ORTHO HEIGHT -    10.3   (meters)       34.    (feet) GPS OBS
 AB9530  ______________________________________________________________________
 AB9530  LMSL orthometric height was determined with geoid model       EGM96
 AB9530  GEOID HEIGHT    -        -42.276 (meters)                     EGM96
 AB9530  GEOID HEIGHT    -        -41.733 (meters)                     EGM08
 AB9530  NAD 83(1996) X  -  3,006,789.390 (meters)                     COMP
 AB9530  NAD 83(1996) Y  - -5,502,115.553 (meters)                     COMP
 AB9530  NAD 83(1996) Z  -  1,164,927.809 (meters)                     COMP
 AB9530  LAPLACE CORR    -          0.03  (seconds)                    DCAR97
 AB9530  HORZ ORDER      -  FIRST
 AB9530  ELLP ORDER      -  FOURTH    CLASS II
 AB9530
 AB9530.The horizontal coordinates were established by GPS observations
 AB9530.and adjusted by the National Geodetic Survey in January 1997.
 AB9530
 AB9530.The orthometric height was determined by GPS observations and a
 AB9530.high-resolution geoid model.
 AB9530
 AB9530.Significant digits in the geoid height do not necessarily reflect accuracy.
 AB9530
 AB9530.Click photographs - Photos may exist for this station.
 AB9530
 AB9530.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AB9530
 AB9530.The Laplace correction was computed from DCAR97 derived deflections.
 AB9530
 AB9530.The ellipsoidal height was determined by GPS observations
 AB9530.and is referenced to NAD 83.
 AB9530
 AB9530. The following values were computed from the NAD 83(1996) position.
 AB9530
 AB9530;                    North         East     Units Scale Factor Converg.
 AB9530;UTM  20      - 1,171,611.250   681,138.005   MT  1.00000600   +0 18 16.2
 AB9530
 AB9530!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AB9530!UTM  20      -   1.00000457  x   1.00000600  =   1.00001057
 AB9530
 AB9530_U.S. NATIONAL GRID SPATIAL ADDRESS: 20PPS8113871611(NAD 83)
 AB9530
 AB9530|---------------------------------------------------------------------|
 AB9530| PID    Reference Object                     Distance      Geod. Az  |
 AB9530|                                                           dddmmss.s |
 AB9530| AB9307 TTPP A                              335.342 METERS 26648     |
 AB9530|---------------------------------------------------------------------|
 AB9530
 AB9530                          SUPERSEDED SURVEY CONTROL
 AB9530
 AB9530.No superseded survey control is available for this station.
 AB9530
 AB9530_MARKER: DH = HORIZONTAL CONTROL DISK
 AB9530_SETTING: 32 = SET IN A RETAINING WALL OR CONCRETE LEDGE
 AB9530_SP_SET: CONCRETE HEADWALL WITH WINGWALL
 AB9530_STAMPING: TTPP B 1996
 AB9530_MARK LOGO: NGS
 AB9530_MAGNETIC: N = NO MAGNETIC MATERIAL
 AB9530_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AB9530+STABILITY: SURFACE MOTION
 AB9530_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AB9530+SATELLITE: SATELLITE OBSERVATIONS - 1996
 AB9530
 AB9530  HISTORY     - Date     Condition        Report By
 AB9530  HISTORY     - 1996     MONUMENTED       NGS
 AB9530
 AB9530                          STATION DESCRIPTION
 AB9530
 AB9530'DESCRIBED BY NATIONAL GEODETIC SURVEY 1996 (AJL)
 AB9530'THE STATION IS LOCATED ON THE ISLAND OF TRINIDAD, AT THE PIARCO
 AB9530'AIRPORT.  NEAR THE CENTER OF THE AIRPORT, IN THE GRASS MEDIAN NORTH OF
 AB9530'THE CONTROL TOWER, ABOUT HALF WAY BETWEEN THE RUNWAY AND THE MAIN
 AB9530'TAXI, AT THE WEST END OF A DRAINAGE DITCH, EAST OF THE CENTRAL TAXI,
 AB9530'SET IN TOP OF AND O.1 M NORTHWEST OF THE SOUTHEAST END OF A CONCRETE
 AB9530'HEAD WALL, ABOUT 0.4 M (1.3 FT) ABOVE THE GROUND SURFACE.
 AB9530'OWNERSHIP--AIRPORT AUTHORITY OF TRINIDAD AND TOBAGO, AIRPORTS
 AB9530'ADMINISTRATION CENTER, CARONI NORTH BANK ROAD, PIARCO, TRINIDAD AND
 AB9530'TOBAGO, P.O.  BOX 1273.  MANAGER AIRPORT OPERATIONS L.  ERIC PIERRE,
 AB9530'PHONE 809-664-8047/9, 664-4101-3.  FAX 809-669-2319.  NOTE--CONTACT
 AB9530'MANAGER AIRPORT OPERATIONS ON ARRIVAL.  NOTE--THIS STATION WAS
 AB9530'SELECTED AS A (SACS) .  LOCATED 59.3 M (194.6 FT) NORTH-NORTHEAST OF
 AB9530'THE MAIN TAXI CENTERLINE, THE STATION IS 0.4 M (1.3 FT) ABOVE THE
 AB9530'GROUND SURFACE AND EASY TO FIND.  BY R.G.  HAYES
1    National Geodetic Survey, Retrieval Date = MAY 10, 2024 21:14:57 EDT
 AB9529 ***********************************************************************
 AB9529  DESIGNATION -  TTPP C
 AB9529  PID         -  AB9529
 AB9529  STATE/COUNTY-  TD/COUNTY OF TRINIDAD AND TOBAGO
 AB9529  COUNTRY     -  TRINIDAD and TOBAGO
 AB9529  USGS QUAD   -  
 AB9529
 AB9529                         *CURRENT SURVEY CONTROL
 AB9529  ______________________________________________________________________
 AB9529* NAD 83(1996) POSITION- 10 35 36.11078(N) 061 20 10.32457(W)   ADJUSTED
 AB9529* NAD 83(1996) ELLIP HT-   -26.521 (meters)        (01/02/97)   ADJUSTED
 AB9529* LMSL    ORTHO HEIGHT -    12.9   (meters)       42.    (feet) GPS OBS
 AB9529  ______________________________________________________________________
 AB9529  LMSL orthometric height was determined with geoid model       EGM96
 AB9529  GEOID HEIGHT    -        -42.285 (meters)                     EGM96
 AB9529  GEOID HEIGHT    -        -41.737 (meters)                     EGM08
 AB9529  NAD 83(1996) X  -  3,007,581.208 (meters)                     COMP
 AB9529  NAD 83(1996) Y  - -5,501,709.075 (meters)                     COMP
 AB9529  NAD 83(1996) Z  -  1,164,818.275 (meters)                     COMP
 AB9529  LAPLACE CORR    -          0.04  (seconds)                    DCAR97
 AB9529  HORZ ORDER      -  FIRST
 AB9529  ELLP ORDER      -  FOURTH    CLASS II
 AB9529
 AB9529.The horizontal coordinates were established by GPS observations
 AB9529.and adjusted by the National Geodetic Survey in January 1997.
 AB9529
 AB9529.The orthometric height was determined by GPS observations and a
 AB9529.high-resolution geoid model.
 AB9529
 AB9529.Significant digits in the geoid height do not necessarily reflect accuracy.
 AB9529
 AB9529.Click photographs - Photos may exist for this station.
 AB9529
 AB9529.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AB9529
 AB9529.The Laplace correction was computed from DCAR97 derived deflections.
 AB9529
 AB9529.The ellipsoidal height was determined by GPS observations
 AB9529.and is referenced to NAD 83.
 AB9529
 AB9529. The following values were computed from the NAD 83(1996) position.
 AB9529
 AB9529;                    North         East     Units Scale Factor Converg.
 AB9529;UTM  20      - 1,171,504.079   682,028.356   MT  1.00001000   +0 18 21.4
 AB9529
 AB9529!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AB9529!UTM  20      -   1.00000417  x   1.00001000  =   1.00001417
 AB9529
 AB9529:                Primary Azimuth Mark                     Grid Az
 AB9529:UTM  20      -  TTPP A                                   274 02 53.3
 AB9529
 AB9529_U.S. NATIONAL GRID SPATIAL ADDRESS: 20PPS8202871504(NAD 83)
 AB9529
 AB9529|---------------------------------------------------------------------|
 AB9529| PID    Reference Object                     Distance      Geod. Az  |
 AB9529|                                                           dddmmss.s |
 AB9529| AB9307 TTPP A                              APPROX. 1.2 KM 2742114.7 |
 AB9529|---------------------------------------------------------------------|
 AB9529
 AB9529                          SUPERSEDED SURVEY CONTROL
 AB9529
 AB9529.No superseded survey control is available for this station.
 AB9529
 AB9529_MARKER: DH = HORIZONTAL CONTROL DISK
 AB9529_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 AB9529_STAMPING: TTPP C 1996
 AB9529_MARK LOGO: NGS
 AB9529_MAGNETIC: N = NO MAGNETIC MATERIAL
 AB9529_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AB9529+STABILITY: SURFACE MOTION
 AB9529_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AB9529+SATELLITE: SATELLITE OBSERVATIONS - 1996
 AB9529
 AB9529  HISTORY     - Date     Condition        Report By
 AB9529  HISTORY     - 1996     MONUMENTED       NGS
 AB9529
 AB9529                          STATION DESCRIPTION
 AB9529
 AB9529'DESCRIBED BY NATIONAL GEODETIC SURVEY 1996 (AJL)
 AB9529'THE STATION IS LOCATED ON THE ISLAND OF TRINIDAD, AT THE PIARCO
 AB9529'AIRPORT.  NEAR THE EAST SIDE OF THE AIRPORT, IN THE GRASS, EAST OF AND
 AB9529'IN LINE WITH THE NORTH CONCRETE EDGE OF THE TIEDOWN AREA IN FRONT OF
 AB9529'NEELCO AIR.  OWNERSHIP--AIRPORT AUTHORITY OF TRINIDAD AND TOBAGO,
 AB9529'AIRPORTS ADMINISTRATION CENTER, CARONI NORTH BANK ROAD, PIARCO,
 AB9529'TRINIDAD AND TOBAGO, P.O.  BOX 1273.  MANAGER AIRPORT OPERATIONS L.
 AB9529'ERIC PIERRE, PHONE 809-664-8047/9, 664-4101-3.  FAX 809-669-2319.
 AB9529'NOTE--CONTACT MANAGER AIRPORT OPERATIONS ON ARRIVAL.  NOTE--THIS
 AB9529'STATION WAS SELECTED AS A (SACS) .  LOCATED 41.9 M (137.5 FT)
 AB9529'EAST-SOUTHEAST OF A WINDSOCK IN FRONT OF NEELCO AIR, 14.2 M (46.6 FT)
 AB9529'EAST OF AND IN LINE WITH THE NORTHEAST CONCRETE CORNER OF THE TIEDOWN
 AB9529'AREA, AND THE MONUMENT IS ABOUT 0.3 M (1.0 FT) ABOVE THE LEVEL OF THE
 AB9529'TIEDOWN AREA AND FLUSH WITH THE GROUND SURFACE.  BY R.G.  HAYES

 *** retrieval complete.
