














                                  SURVEY CONTROL DATA
                                
                             STATE=AC
                             [FEBRUARY 20, 2026 21]
                    PROGRAM = datasheet95, VERSION = 8.12.5.20
1    National Geodetic Survey, Retrieval Date = FEBRUARY 20, 2026 21:20:07 EST
 DR8179 ***********************************************************************
 DR8179  CORS        -  This is a GPS Continuously Operating Reference Station.
 DR8179  DESIGNATION -  ANGUILLA_AIA2012 CORS ARP
 DR8179  CORS_ID     -  CN02
 DR8179  PID         -  DR8179
 DR8179  STATE/COUNTY-  AC/PARISH OF ANTIGUA AND BARBUDA
 DR8179  COUNTRY     -  ANTIGUA AND BARBUDA
 DR8179  USGS QUAD   -  
 DR8179
 DR8179                         *CURRENT SURVEY CONTROL
 DR8179  ______________________________________________________________________
 DR8179* NAD 83       POSITION- 18 12 14.10780(N) 063 03 14.65562(W)   ADJUSTED
 DR8179* NAD 83       ELLIP HT-    -7.061 (meters)        (07/??/22)   ADJUSTED
 DR8179* NAD 83       EPOCH   -  2010.00
 DR8179  ______________________________________________________________________
 DR8179  GEOID HEIGHT    -        -44.474 (meters)                     EGM08
 DR8179  NAD 83       X  -  2,746,488.508 (meters)                     COMP
 DR8179  NAD 83       Y  - -5,402,886.061 (meters)                     COMP
 DR8179  NAD 83       Z  -  1,979,835.208 (meters)                     COMP
 DR8179
 DR8179.Formal positional accuracy estimates are not available for this CORS
 DR8179.because its coordinates were determined in part using modeled velocities.
 DR8179.A time-series residual plot is available that shows daily coordinate
 DR8179.variations relative to the published coordinates and modeled velocities.
 DR8179.Large residuals may indicate a potential error in the modeled velocities.
 DR8179
 DR8179.Residual plot at:
 DR8179.https://geodesy.noaa.gov/CORS/ncn_station_pages/index.html?stationID=CN02.
 DR8179
 DR8179.The coordinates were established by GPS observations
 DR8179.and adjusted by the National Geodetic Survey in July 2022.
 DR8179
 DR8179.The coordinates are valid at the epoch date displayed above
 DR8179.which is a decimal equivalence of Year/Month/Day.
 DR8179
 DR8179.NGS completed the third reprocessing of daily RINEX data from 1996 to 2022
 DR8179.for all stations in the NOAA CORS Network (NCN).  The reprocessed solution,
 DR8179.known as the Multi-Year CORS Solution 3 (MYCS3), is aligned with the
 DR8179.ITFR2020 global frame, epoch 2020.00.  The resulting MYCS3 coordinates
 DR8179.were then transformed to NAD83(2011/MA11/PA11), maintaining the currently
 DR8179.published epoch of 2010.00.
 DR8179
 DR8179.Additional information on MYCS is available at:
 DR8179.https://geodesy.noaa.gov/CORS/index.shtml
 DR8179
 DR8179.Significant digits in the geoid height do not necessarily reflect accuracy.
 DR8179
 DR8179.The PID for the CORS L1 Phase Center is DR8180.
 DR8179
 DR8179.Click photographs - Photos may exist for this station.
 DR8179
 DR8179.The XYZ, and position/ellipsoidal ht. are equivalent.
 DR8179
 DR8179.The ellipsoidal height was determined by GPS observations
 DR8179.and is referenced to NAD 83.
 DR8179
 DR8179. The following values were computed from the NAD 83 position.
 DR8179
 DR8179;                    North         East     Units Scale Factor Converg.
 DR8179;UTM  20      - 2,012,747.411   494,282.516   MT  0.99960040   -0 01 00.8
 DR8179
 DR8179!             -  Elev Factor  x  Scale Factor =   Combined Factor
 DR8179!UTM  20      -   1.00000111  x   0.99960040  =   0.99960151
 DR8179
 DR8179_U.S. NATIONAL GRID SPATIAL ADDRESS: 20QMF9428212747(NAD 83)
 DR8179
 DR8179                          SUPERSEDED SURVEY CONTROL
 DR8179
 DR8179.No superseded survey control is available for this station.
 DR8179
 DR8179_MARKER: STATION IS THE ANTENNA REFERENCE POINT OF THE GPS ANTENNA
 DR8179
 DR8179                          STATION DESCRIPTION
 DR8179
 DR8179'DESCRIBED BY NATIONAL GEODETIC SURVEY 2022
 DR8179'THIS STATION IS PART OF THE NOAA CORS NETWORK (NCN).  LATEST INFORMATION
 DR8179'INCLUDING POSITIONS AND VELOCITIES ARE AVAILABLE IN THE COORDINATE
 DR8179'AND LOG FILES ACCESSIBLE AT:
 DR8179'https://geodesy.noaa.gov/CORS/index.shtml
1    National Geodetic Survey, Retrieval Date = FEBRUARY 20, 2026 21:20:07 EST
 DR8181 ***********************************************************************
 DR8181  CORS        -  This is a GPS Continuously Operating Reference Station.
 DR8181  DESIGNATION -  ANGUILLA_AIA2012 CORS GRP
 DR8181  CORS_ID     -  CN02
 DR8181  PID         -  DR8181
 DR8181  STATE/COUNTY-  AC/PARISH OF ANTIGUA AND BARBUDA
 DR8181  COUNTRY     -  ANTIGUA AND BARBUDA
 DR8181  USGS QUAD   -  
 DR8181
 DR8181                         *CURRENT SURVEY CONTROL
 DR8181  ______________________________________________________________________
 DR8181* NAD 83       POSITION- 18 12 14.10780(N) 063 03 14.65562(W)   ADJUSTED
 DR8181* NAD 83       ELLIP HT-    -7.070 (meters)        (07/??/22)   ADJUSTED
 DR8181* NAD 83       EPOCH   -  2010.00
 DR8181  ______________________________________________________________________
 DR8181  GEOID HEIGHT    -        -44.474 (meters)                     EGM08
 DR8181  NAD 83       X  -  2,746,488.504 (meters)                     COMP
 DR8181  NAD 83       Y  - -5,402,886.054 (meters)                     COMP
 DR8181  NAD 83       Z  -  1,979,835.205 (meters)                     COMP
 DR8181  LAPLACE CORR    -          0.56  (seconds)                    DCAR97
 DR8181
 DR8181.Formal positional accuracy estimates are not available for this CORS
 DR8181.because its coordinates were determined in part using modeled velocities.
 DR8181.A time-series residual plot is available that shows daily coordinate
 DR8181.variations relative to the published coordinates and modeled velocities.
 DR8181.Large residuals may indicate a potential error in the modeled velocities.
 DR8181
 DR8181.Residual plot at:
 DR8181.https://geodesy.noaa.gov/CORS/ncn_station_pages/index.html?stationID=CN02.
 DR8181
 DR8181.The horizontal coordinates were established by GPS observations
 DR8181.and adjusted by the National Geodetic Survey in July 2022.
 DR8181
 DR8181.The horizontal coordinates are valid at the epoch date displayed above
 DR8181.which is a decimal equivalence of Year/Month/Day.
 DR8181
 DR8181.NGS completed the third reprocessing of daily RINEX data from 1996 to 2022
 DR8181.for all stations in the NOAA CORS Network (NCN).  The reprocessed solution,
 DR8181.known as the Multi-Year CORS Solution 3 (MYCS3), is aligned with the
 DR8181.ITFR2020 global frame, epoch 2020.00.  The resulting MYCS3 coordinates
 DR8181.were then transformed to NAD83(2011/MA11/PA11), maintaining the currently
 DR8181.published epoch of 2010.00.
 DR8181
 DR8181.Additional information on MYCS is available at:
 DR8181.https://geodesy.noaa.gov/CORS/index.shtml
 DR8181
 DR8181.Significant digits in the geoid height do not necessarily reflect accuracy.
 DR8181
 DR8181.Click photographs - Photos may exist for this station.
 DR8181
 DR8181.The XYZ, and position/ellipsoidal ht. are equivalent.
 DR8181
 DR8181.The Laplace correction was computed from DCAR97 derived deflections.
 DR8181
 DR8181.The ellipsoidal height was determined by GPS observations
 DR8181.and is referenced to NAD 83.
 DR8181
 DR8181. The following values were computed from the NAD 83 position.
 DR8181
 DR8181;                    North         East     Units Scale Factor Converg.
 DR8181;UTM  20      - 2,012,747.411   494,282.516   MT  0.99960040   -0 01 00.8
 DR8181
 DR8181!             -  Elev Factor  x  Scale Factor =   Combined Factor
 DR8181!UTM  20      -   1.00000111  x   0.99960040  =   0.99960151
 DR8181
 DR8181_U.S. NATIONAL GRID SPATIAL ADDRESS: 20QMF9428212747(NAD 83)
 DR8181
 DR8181                          SUPERSEDED SURVEY CONTROL
 DR8181
 DR8181.No superseded survey control is available for this station.
 DR8181
 DR8181_STAMPING: UNKNOWN
 DR8181
 DR8181                          STATION DESCRIPTION
 DR8181
 DR8181'THIS MONUMENT IS ASSOCIATED WITH STATION 'CN02'
 DR8181'AND IS A PART OF THE NOAA CORS NETWORK (NCN). LATEST INFORMATION
 DR8181'INCLUDING POSITIONS AND VEOCITIES ARE AVAILABLE IN THE COORDINATE
 DR8181'AND LOG FILES ACCESSIBLE AT:
 DR8181'https://geodesy.noaa.gov/CORS/index.shtml
 DR8181'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 20, 2026 21:20:07 EST
 AB9239 ***********************************************************************
 AB9239  DESIGNATION -  BA 16
 AB9239  PID         -  AB9239
 AB9239  STATE/COUNTY-  AC/PARISH OF ANTIGUA AND BARBUDA
 AB9239  COUNTRY     -  ANTIGUA AND BARBUDA
 AB9239  USGS QUAD   -  
 AB9239
 AB9239                         *CURRENT SURVEY CONTROL
 AB9239  ______________________________________________________________________
 AB9239* NAD 83(2011) POSITION- 17 32 45.26489(N) 061 45 57.13996(W)   NO CHECK
 AB9239* NAD 83(2011) ELLIP HT-   -34.584 (meters)        (06/27/12)   NO CHECK
 AB9239* NAD 83(2011) EPOCH   -  2010.00
 AB9239* LMSL    ORTHO HEIGHT -     5.    (meters)       16.    (feet) GPS OBS
 AB9239  ______________________________________________________________________
 AB9239  LMSL orthometric height was determined with geoid model       EGM96
 AB9239  GEOID HEIGHT    -        -42.552 (meters)                     EGM96
 AB9239  GEOID HEIGHT    -        -42.519 (meters)                     EGM08
 AB9239  NAD 83(2011) X  -  2,877,821.471 (meters)                     COMP
 AB9239  NAD 83(2011) Y  - -5,359,446.571 (meters)                     COMP
 AB9239  NAD 83(2011) Z  -  1,910,514.777 (meters)                     COMP
 AB9239  LAPLACE CORR    -         -8.11  (seconds)                    DCAR97
 AB9239
 AB9239  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AB9239  Standards:
 AB9239         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AB9239            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AB9239  -------------------------------------------------------------------
 AB9239  NETWORK   40.31  48.98          14.17  15.47  24.99     -0.89652399
 AB9239  -------------------------------------------------------------------
 AB9239  Click here for local accuracies and other accuracy information.
 AB9239
 AB9239.The horizontal coordinates were established by GPS observations
 AB9239.and adjusted by the National Geodetic Survey in June 2012.
 AB9239
 AB9239.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AB9239.been affixed to the stable North American tectonic plate. See 
 AB9239.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AB9239
 AB9239.The horizontal coordinates are valid at the epoch date displayed above
 AB9239.which is a decimal equivalence of Year/Month/Day.
 AB9239
 AB9239.No horizontal observational check was made to the station.
 AB9239
 AB9239.The orthometric height was determined by GPS observations and a
 AB9239.high-resolution geoid model.
 AB9239
 AB9239.No vertical observational check was made to the station.
 AB9239
 AB9239.Significant digits in the geoid height do not necessarily reflect accuracy.
 AB9239
 AB9239.Click photographs - Photos may exist for this station.
 AB9239
 AB9239.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AB9239
 AB9239.The Laplace correction was computed from DCAR97 derived deflections.
 AB9239
 AB9239.The ellipsoidal height was determined by GPS observations
 AB9239.and is referenced to NAD 83.
 AB9239
 AB9239. The following values were computed from the NAD 83(2011) position.
 AB9239
 AB9239;                    North         East     Units Scale Factor Converg.
 AB9239;UTM  20      - 1,940,372.944   630,986.653   MT  0.99981214   +0 22 19.6
 AB9239
 AB9239!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AB9239!UTM  20      -   1.00000544  x   0.99981214  =   0.99981758
 AB9239
 AB9239_U.S. NATIONAL GRID SPATIAL ADDRESS: 20QPE3098640372(NAD 83)
 AB9239
 AB9239                          SUPERSEDED SURVEY CONTROL
 AB9239
 AB9239  NAD 83(2007)-  17 32 45.26389(N)    061 45 57.14524(W) AD(2002.00) 0
 AB9239  ELLIP H (02/10/07)  -34.569  (m)                       GP(2002.00)    
 AB9239  NAD 83(1996)-  17 32 45.26287(N)    061 45 57.14906(W) AD(       ) 1
 AB9239  ELLIP H (12/09/96)  -34.530  (m)                       GP(       ) 1 1
 AB9239
 AB9239.Superseded values are not recommended for survey control.
 AB9239
 AB9239.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AB9239.See file dsdata.pdf to determine how the superseded data were derived.
 AB9239
 AB9239_MARKER: DD = SURVEY DISK
 AB9239_SETTING: 0 = UNSPECIFIED SETTING
 AB9239_STAMPING: BA 16
 AB9239_MAGNETIC: O = OTHER; SEE DESCRIPTION
 AB9239_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AB9239+STABILITY: SURFACE MOTION
 AB9239_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AB9239+SATELLITE: SATELLITE OBSERVATIONS - April 24, 1996
 AB9239
 AB9239  HISTORY     - Date     Condition        Report By
 AB9239  HISTORY     - UNK      MONUMENTED
 AB9239  HISTORY     - 19960424 GOOD             NGS
 AB9239
 AB9239                          STATION DESCRIPTION
 AB9239
 AB9239'DESCRIBED BY NATIONAL GEODETIC SURVEY 1996
 AB9239'NO TEXT AVAILABLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 20, 2026 21:20:07 EST
 AB9236 ***********************************************************************
 AB9236  DESIGNATION -  NO 3
 AB9236  PID         -  AB9236
 AB9236  STATE/COUNTY-  AC/PARISH OF ANTIGUA AND BARBUDA
 AB9236  COUNTRY     -  ANTIGUA AND BARBUDA
 AB9236  USGS QUAD   -  
 AB9236
 AB9236                         *CURRENT SURVEY CONTROL
 AB9236  ______________________________________________________________________
 AB9236* NAD 83(2011) POSITION- 17 09 31.59586(N) 061 47 32.96571(W)   NO CHECK
 AB9236* NAD 83(2011) ELLIP HT-   -32.499 (meters)        (06/27/12)   NO CHECK
 AB9236* NAD 83(2011) EPOCH   -  2010.00
 AB9236* LMSL    ORTHO HEIGHT -     6.49  (meters)       21.3   (feet) LEVELING
 AB9236  ______________________________________________________________________
 AB9236  GEOID HEIGHT    -        -41.047 (meters)                     EGM08
 AB9236  NAD 83(2011) X  -  2,881,372.089 (meters)                     COMP
 AB9236  NAD 83(2011) Y  - -5,372,045.460 (meters)                     COMP
 AB9236  NAD 83(2011) Z  -  1,869,620.704 (meters)                     COMP
 AB9236  LAPLACE CORR    -         -2.79  (seconds)                    DCAR97
 AB9236  VERT ORDER      -  THIRD ?
 AB9236
 AB9236  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AB9236  Standards:
 AB9236         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AB9236            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AB9236  -------------------------------------------------------------------
 AB9236  NETWORK    5.96   7.86           1.52   2.91   4.01     -0.02569130
 AB9236  -------------------------------------------------------------------
 AB9236  Click here for local accuracies and other accuracy information.
 AB9236
 AB9236.The horizontal coordinates were established by GPS observations
 AB9236.and adjusted by the National Geodetic Survey in June 2012.
 AB9236
 AB9236.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AB9236.been affixed to the stable North American tectonic plate. See 
 AB9236.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AB9236
 AB9236.The horizontal coordinates are valid at the epoch date displayed above
 AB9236.which is a decimal equivalence of Year/Month/Day.
 AB9236
 AB9236.No horizontal observational check was made to the station.
 AB9236
 AB9236.The orthometric height was determined by differential leveling.
 AB9236.The vertical network tie was performed by a horz. field party for horz.
 AB9236.obs reductions. Reset procedures were used to establish the elevation.
 AB9236
 AB9236.Significant digits in the geoid height do not necessarily reflect accuracy.
 AB9236
 AB9236.Click photographs - Photos may exist for this station.
 AB9236
 AB9236.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AB9236
 AB9236.The Laplace correction was computed from DCAR97 derived deflections.
 AB9236
 AB9236.The ellipsoidal height was determined by GPS observations
 AB9236.and is referenced to NAD 83.
 AB9236
 AB9236. The following values were computed from the NAD 83(2011) position.
 AB9236
 AB9236;                    North         East     Units Scale Factor Converg.
 AB9236;UTM  20      - 1,897,519.140   628,430.408   MT  0.99980395   +0 21 22.6
 AB9236
 AB9236!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AB9236!UTM  20      -   1.00000511  x   0.99980395  =   0.99980906
 AB9236
 AB9236_U.S. NATIONAL GRID SPATIAL ADDRESS: 20QPD2843097519(NAD 83)
 AB9236
 AB9236                          SUPERSEDED SURVEY CONTROL
 AB9236
 AB9236  NAD 83(2007)-  17 09 31.59486(N)    061 47 32.97098(W) AD(2002.00) 0
 AB9236  ELLIP H (02/10/07)  -32.484  (m)                       GP(2002.00)    
 AB9236  NAD 83(1996)-  17 09 31.59385(N)    061 47 32.97479(W) AD(       ) 1
 AB9236  ELLIP H (12/09/96)  -32.445  (m)                       GP(       ) 1 1
 AB9236
 AB9236.Superseded values are not recommended for survey control.
 AB9236
 AB9236.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AB9236.See file dsdata.pdf to determine how the superseded data were derived.
 AB9236
 AB9236_MARKER: DB = BENCH MARK DISK
 AB9236_SETTING: 34 = SET IN THE FOOTINGS OF SMALL/MEDIUM STRUCTURES
 AB9236_SP_SET: HEADWALL
 AB9236_STAMPING: NO 3 1968
 AB9236_MARK LOGO: CGS
 AB9236_MAGNETIC: N = NO MAGNETIC MATERIAL
 AB9236_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AB9236+STABILITY: SURFACE MOTION
 AB9236_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AB9236+SATELLITE: SATELLITE OBSERVATIONS - March 22, 1996
 AB9236
 AB9236  HISTORY     - Date     Condition        Report By
 AB9236  HISTORY     - 1968     MONUMENTED       CGS
 AB9236  HISTORY     - 19960322 GOOD             NGS
 AB9236
 AB9236                          STATION DESCRIPTION
 AB9236
 AB9236'DESCRIBED BY NATIONAL GEODETIC SURVEY 1996 (AJL)
 AB9236'THE STATION IS LOCATED IN THE COUNTRY OF ANGUILLA, AT THE DEACTIVATED
 AB9236'US NAVAL FACILITY ON SHOAL POINT NOW KNOWN AS CAMP BLIZZARD AND ABOUT
 AB9236'1.4 MI (2.3 KM) NORTH OF THE V C BIRD INTERNATIONAL AIRPORT TERMINAL
 AB9236'BUILDING.  OWNERSHIP--COUNTRY OF ANTIGUA AND BARBUDA, ANTIGUA DEFENCE
 AB9236'FORCES, CAMP BLIZZARD, ANTIGUA.  CONTACT AT THE BASE IS MAJOR CROFT AT
 AB9236'PHONE (809) 462-1458.  TO REACH THE STATION FROM THE MAIN GATE AT CAMP
 AB9236'BLIZZARD GO NORTHERLY ON A PAVED ROAD FOR 0.25 MI (0.40 KM) TO A
 AB9236'OFFSET INTERSECTION, BEAR RIGHT THEN LEFT AND GO NORTHERLY ON A GRAVEL
 AB9236'ROAD FOR 89 FT (27.1 M) TO THE STATION JUST AHEAD IN A CONCRETE
 AB9236'HEADWALL.  THE STATION IS A CGS BENCH MARK DISK SET INTO THE TOP
 AB9236'CENTER OF A 10 FT (3.0 M) BY 0.7 FT (21.3 CM) CONCRETE HEADWALL, 56.9
 AB9236'FT (17.3 M) SOUTH-SOUTHWEST OF THE SOUTH CORNER OF THE SALTWATER
 AB9236'PUMPHOUSE, 35.0 FT (10.7 M) WEST OF THE WEST CORNER OF THE PUBLIC
 AB9236'WORKS BUILDING AND 27.0 FT (8.2 M) EAST OF THE EAST CORNER OF A
 AB9236'CINDERBLOCK BUILDING (81) .
1    National Geodetic Survey, Retrieval Date = FEBRUARY 20, 2026 21:20:07 EST
 AB9235 ***********************************************************************
 AB9235  DESIGNATION -  TAPA A
 AB9235  PID         -  AB9235
 AB9235  STATE/COUNTY-  AC/PARISH OF ANTIGUA AND BARBUDA
 AB9235  COUNTRY     -  ANTIGUA AND BARBUDA
 AB9235  USGS QUAD   -  
 AB9235
 AB9235                         *CURRENT SURVEY CONTROL
 AB9235  ______________________________________________________________________
 AB9235* NAD 83(2011) POSITION- 17 08 07.73016(N) 061 47 33.09102(W)   ADJUSTED
 AB9235* NAD 83(2011) ELLIP HT-   -19.049 (meters)        (06/27/12)   ADJUSTED
 AB9235* NAD 83(2011) EPOCH   -  2010.00
 AB9235* LMSL    ORTHO HEIGHT -    19.2   (meters)       63.    (feet) GPS OBS
 AB9235  ______________________________________________________________________
 AB9235  LMSL orthometric height was determined with geoid model       EGM96
 AB9235  GEOID HEIGHT    -        -40.941 (meters)                     EGM96
 AB9235  GEOID HEIGHT    -        -41.015 (meters)                     EGM08
 AB9235  NAD 83(2011) X  -  2,881,734.181 (meters)                     COMP
 AB9235  NAD 83(2011) Y  - -5,372,728.382 (meters)                     COMP
 AB9235  NAD 83(2011) Z  -  1,867,161.086 (meters)                     COMP
 AB9235  LAPLACE CORR    -         -2.70  (seconds)                    DCAR97
 AB9235
 AB9235  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AB9235  Standards:
 AB9235         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AB9235            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AB9235  -------------------------------------------------------------------
 AB9235  NETWORK    5.55   4.43           0.49   2.82   2.26     -0.06135595
 AB9235  -------------------------------------------------------------------
 AB9235  Click here for local accuracies and other accuracy information.
 AB9235
 AB9235.The horizontal coordinates were established by GPS observations
 AB9235.and adjusted by the National Geodetic Survey in June 2012.
 AB9235
 AB9235.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AB9235.been affixed to the stable North American tectonic plate. See 
 AB9235.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AB9235
 AB9235.The horizontal coordinates are valid at the epoch date displayed above
 AB9235.which is a decimal equivalence of Year/Month/Day.
 AB9235
 AB9235.The orthometric height was determined by GPS observations and a
 AB9235.high-resolution geoid model.
 AB9235
 AB9235.Significant digits in the geoid height do not necessarily reflect accuracy.
 AB9235
 AB9235.Click photographs - Photos may exist for this station.
 AB9235
 AB9235.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AB9235
 AB9235.The Laplace correction was computed from DCAR97 derived deflections.
 AB9235
 AB9235.The ellipsoidal height was determined by GPS observations
 AB9235.and is referenced to NAD 83.
 AB9235
 AB9235. The following values were computed from the NAD 83(2011) position.
 AB9235
 AB9235;                    North         East     Units Scale Factor Converg.
 AB9235;UTM  20      - 1,894,941.481   628,442.723   MT  0.99980399   +0 21 20.9
 AB9235
 AB9235!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AB9235!UTM  20      -   1.00000299  x   0.99980399  =   0.99980698
 AB9235
 AB9235:                Primary Azimuth Mark                     Grid Az
 AB9235:UTM  20      -  TAPA B                                   055 42 27.8
 AB9235
 AB9235_U.S. NATIONAL GRID SPATIAL ADDRESS: 20QPD2844294941(NAD 83)
 AB9235
 AB9235|---------------------------------------------------------------------|
 AB9235| PID    Reference Object                     Distance      Geod. Az  |
 AB9235|                                                           dddmmss.s |
 AB9235| AB9558 TAPA B                              APPROX. 1.2 KM 0560348.7 |
 AB9235| AB9557 TAPA C                              APPROX. 1.2 KM 2472922.0 |
 AB9235|---------------------------------------------------------------------|
 AB9235
 AB9235                          SUPERSEDED SURVEY CONTROL
 AB9235
 AB9235  NAD 83(2007)-  17 08 07.72916(N)    061 47 33.09629(W) AD(2002.00) 0
 AB9235  ELLIP H (02/10/07)  -19.034  (m)                       GP(2002.00)    
 AB9235  NAD 83(1996)-  17 08 07.72815(N)    061 47 33.10009(W) AD(       ) A
 AB9235  ELLIP H (12/09/96)  -18.995  (m)                       GP(       ) 1 1
 AB9235
 AB9235.Superseded values are not recommended for survey control.
 AB9235
 AB9235.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AB9235.See file dsdata.pdf to determine how the superseded data were derived.
 AB9235
 AB9235_MARKER: DH = HORIZONTAL CONTROL DISK
 AB9235_SETTING: 66 = SET IN ROCK OUTCROP
 AB9235_STAMPING: TAPA A 1996
 AB9235_MARK LOGO: NGS
 AB9235_MAGNETIC: N = NO MAGNETIC MATERIAL
 AB9235_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 AB9235+STABILITY: POSITION/ELEVATION WELL
 AB9235_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AB9235+SATELLITE: SATELLITE OBSERVATIONS - June 12, 2004
 AB9235
 AB9235  HISTORY     - Date     Condition        Report By
 AB9235  HISTORY     - 1996     MONUMENTED       NGS
 AB9235  HISTORY     - 20040612 GOOD             INDIV
 AB9235
 AB9235                          STATION DESCRIPTION
 AB9235
 AB9235'DESCRIBED BY NATIONAL GEODETIC SURVEY 1996 (AJL)
 AB9235'THE STATION IS LOCATED IN THE COUNTRY OF ANTIGUA, AT THE V C BIRD
 AB9235'INTERNATIONAL AIRPORT, ABOUT 0.3 MI (0.5 KM) SOUTH OF THE TERMINAL
 AB9235'BUILDING, ABOUT HALFWAY UP A HILL WITH A OLD CONCRETE WATER CISTERN
 AB9235'NEAR THE TOP AND SET INTO THE TOP OF A 11 FT (3.4 M) BY 10 FT (3.0 M)
 AB9235'ROCK OUTCROP PROJECTING 3 FT (0.9 M) ABOVE THE GROUND LEVEL.
 AB9235'OWNERSHIP--COUNTRY OF ANTIGUA AND BARBUDA, V C BIRD INTERNATIONAL
 AB9235'AIRPORT, PO BOX 1051, ST JOHNS, ANTIGUA.  AERODROME SUPERINTENDENT IS
 AB9235'MR ERROLL GEORGE.  AIRPORT CONTACT IS CHIEF OF AIR TRAFFIC SERVICES,
 AB9235'MR ANTHONY MEADE, PHONE (809) 462-0358, FAX (809) 462-0642.  THIS IS A
 AB9235'CONTROLED AIRPORT, PERMISSION TO ENTER THE AIRPORT COMPOUND IS
 AB9235'REQUIRED.  NOTE--AIRCRAFT TRAFFIC IS VERY HEAVY IN THE AFTERNOON.  TO
 AB9235'REACH THE STATION FROM THE SOUTHEAST SIDE OF THE TERMINAL BUILDING GO
 AB9235'SOUTHEAST, THEN SOUTHWEST ON THE APRON FOR 0.10 MI (0.16 KM) TO A
 AB9235'CONNECTOR TAXIWAY (A) ON THE LEFT (SOUTHWESTERNMOST OF 2) , TURN LEFT
 AB9235'AND GO SOUTHEAST ON THE CONNECTOR TAXIWAY CROSSING RUNWAY 07/25, THEN
 AB9235'BEAR SLIGHT RIGHT ACROSS THE GRASS AND UP THE HILL FOR 0.20 MI (0.32
 AB9235'KM) TO THE STATION.  THE STATION IS ABOUT 200 FT (61.0 M)
 AB9235'NORTH-NORTHWEST OF THE NORTHWEST CORNER OF A OLD ABOVE GROUND CISTERN
 AB9235'AND 66 FT (20.1 M) SOUTHWEST OF THE EXTENDED CENTER OF THE CONNECTOR
 AB9235'TAXIWAY.  THIS IS THE PRIMARY AIRPORT CONTROL STATION.  NOTE--THIS
 AB9235'STATION MAY BE A SHORT PACK, A PATH TO DRIVE TO THE STATION SHOULD BE
 AB9235'IN PLACE BY THE TIME OF OBSERVATIONS.  AT THIS TIME THE PERIMETER
 AB9235'FENCE IS BETWEEN THE RUNWAY AND THE STATION BUT A WORK CREW IS IN THE
 AB9235'PROCESS OF MOVING IT TO THE SOUTHEAST.
 AB9235
 AB9235                          STATION RECOVERY (2004)
 AB9235
 AB9235'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2004 (AE)
 AB9235'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 20, 2026 21:20:07 EST
 AB9558 ***********************************************************************
 AB9558  DESIGNATION -  TAPA B
 AB9558  PID         -  AB9558
 AB9558  STATE/COUNTY-  AC/PARISH OF ANTIGUA AND BARBUDA
 AB9558  COUNTRY     -  ANTIGUA AND BARBUDA
 AB9558  USGS QUAD   -  
 AB9558
 AB9558                         *CURRENT SURVEY CONTROL
 AB9558  ______________________________________________________________________
 AB9558* NAD 83(1996) POSITION- 17 08 29.63789(N) 061 46 59.22739(W)   ADJUSTED
 AB9558* NAD 83(1996) ELLIP HT-   -30.798 (meters)        (01/02/97)   ADJUSTED
 AB9558* LMSL    ORTHO HEIGHT -     7.5   (meters)       25.    (feet) GPS OBS
 AB9558  ______________________________________________________________________
 AB9558  LMSL orthometric height was determined with geoid model       EGM96
 AB9558  GEOID HEIGHT    -        -40.985 (meters)                     EGM96
 AB9558  GEOID HEIGHT    -        -41.072 (meters)                     EGM08
 AB9558  NAD 83(1996) X  -  2,882,517.068 (meters)                     COMP
 AB9558  NAD 83(1996) Y  - -5,372,070.428 (meters)                     COMP
 AB9558  NAD 83(1996) Z  -  1,867,801.200 (meters)                     COMP
 AB9558  LAPLACE CORR    -         -2.81  (seconds)                    DCAR97
 AB9558  HORZ ORDER      -  FIRST
 AB9558  ELLP ORDER      -  FOURTH    CLASS II
 AB9558
 AB9558.The horizontal coordinates were established by GPS observations
 AB9558.and adjusted by the National Geodetic Survey in January 1997.
 AB9558
 AB9558.The orthometric height was determined by GPS observations and a
 AB9558.high-resolution geoid model.
 AB9558
 AB9558.Significant digits in the geoid height do not necessarily reflect accuracy.
 AB9558
 AB9558.Click photographs - Photos may exist for this station.
 AB9558
 AB9558.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AB9558
 AB9558.The Laplace correction was computed from DCAR97 derived deflections.
 AB9558
 AB9558.The ellipsoidal height was determined by GPS observations
 AB9558.and is referenced to NAD 83.
 AB9558
 AB9558. The following values were computed from the NAD 83(1996) position.
 AB9558
 AB9558;                    North         East     Units Scale Factor Converg.
 AB9558;UTM  20      - 1,895,621.061   629,439.237   MT  0.99980716   +0 21 31.3
 AB9558
 AB9558!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AB9558!UTM  20      -   1.00000484  x   0.99980716  =   0.99981200
 AB9558
 AB9558:                Primary Azimuth Mark                     Grid Az
 AB9558:UTM  20      -  TAPA A                                   235 42 27.4
 AB9558
 AB9558_U.S. NATIONAL GRID SPATIAL ADDRESS: 20QPD2943995621(NAD 83)
 AB9558
 AB9558|---------------------------------------------------------------------|
 AB9558| PID    Reference Object                     Distance      Geod. Az  |
 AB9558|                                                           dddmmss.s |
 AB9558| AB9235 TAPA A                              APPROX. 1.2 KM 2360358.7 |
 AB9558|---------------------------------------------------------------------|
 AB9558
 AB9558                          SUPERSEDED SURVEY CONTROL
 AB9558
 AB9558.No superseded survey control is available for this station.
 AB9558
 AB9558_MARKER: DH = HORIZONTAL CONTROL DISK
 AB9558_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 AB9558_SP_SET: CONCRETE TAXIWAY
 AB9558_STAMPING: TAPA B 1996
 AB9558_MARK LOGO: NGS
 AB9558_MAGNETIC: N = NO MAGNETIC MATERIAL
 AB9558_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AB9558+STABILITY: SURFACE MOTION
 AB9558_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AB9558+SATELLITE: SATELLITE OBSERVATIONS - 1996
 AB9558
 AB9558  HISTORY     - Date     Condition        Report By
 AB9558  HISTORY     - 1996     MONUMENTED       NGS
 AB9558
 AB9558                          STATION DESCRIPTION
 AB9558
 AB9558'DESCRIBED BY NATIONAL GEODETIC SURVEY 1996 (AJL)
 AB9558'THE STATION IS LOCATED IN THE COUNTRY OF ANTIGUA, AT THE V C BIRD
 AB9558'INTERNATIONAL AIRPORT, SET INTO THE PARALLEL TAXIWAY FOR RUNWAY 10
 AB9558'(NOW CLOSED) AND EAST OF THE JUNCTION WITH RUNWAY 07/25.
 AB9558'OWNERSHIP--COUNTRY OF ANTIGUA AND BARBUDA, V C BIRD INTERNATIONAL
 AB9558'AIRPORT, PO BOX 1051, ST JOHNS, ANTIGUA.  AERODROME SUPERINTENDENT IS
 AB9558'MR ERROLL GEORGE.  AIRPORT CONTACT IS CHIEF OF AIR TRAFFIC SERVICES,
 AB9558'MR ANTHONY MEADE, PHONE (809) 462-0358, FAX (809) 462-0642.  THIS IS A
 AB9558'CONTROLED AIRPORT, PERMISSION TO ENTER THE AIRPORT COMPOUND IS
 AB9558'REQUIRED.  NOTE--AIRCRAFT TRAFFIC IS VERY HEAVY IN THE AFTERNOON.  TO
 AB9558'REACH THE STATION FROM THE SOUTHEAST SIDE OF THE TERMINAL BUILDING GO
 AB9558'NORTHEAST ON THE APRON, THEN ON A TAXIWAY FOR 0.25 MI (0.40 KM) TO THE
 AB9558'OLD RUNWAY 10 (NOW CLOSED) , BEAR RIGHT AND GO EAST ON THE OLD RUNWAY
 AB9558'FOR 0.30 MI (0.48 KM) CROSSING RUNWAY 07/25 TO A DIM TRACK ROAD ON THE
 AB9558'LEFT AT THE PAPI LIGHTS, TURN LEFT AND GO NORTHEAST ON THE DIM TRACK
 AB9558'ROAD FOR 0.05 MI (0.08 KM) TO THE OLD PARALLEL TAXIWAY FOR RUNWAY 10
 AB9558'AND THE STATION SET INTO THE CONCRETE TAXIWAY ON THE RIGHT.  THE
 AB9558'STATION IS 281.7 FT (85.9 M) EAST OF A RUNWAY LIGHT AT THE
 AB9558'INTERSECTION OF THE TAXIWAY AND RUNWAY 07/25, 16.0 FT (4.9 M) SOUTH OF
 AB9558'THE TAXIWAY CENTER AND 9.0 FT (2.7 M) NORTH OF THE SOUTH EDGE OF THE
 AB9558'TAXIWAY.  THIS IS A SECONDARY AIRPORT CONTROL STATION. NOTE--AT THIS
 AB9558'TIME THE LINE OF SITE BETWEEN THIS STATION AND THE PAC IS OBSTRUCTED
 AB9558'BY BRUSH BUT SHOULD BE CLEARED BY AIRPORT PESONNEL IN THE NEAR FUTURE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 20, 2026 21:20:07 EST
 AB9557 ***********************************************************************
 AB9557  DESIGNATION -  TAPA C
 AB9557  PID         -  AB9557
 AB9557  STATE/COUNTY-  AC/PARISH OF ANTIGUA AND BARBUDA
 AB9557  COUNTRY     -  ANTIGUA AND BARBUDA
 AB9557  USGS QUAD   -  
 AB9557
 AB9557                         *CURRENT SURVEY CONTROL
 AB9557  ______________________________________________________________________
 AB9557* NAD 83(1996) POSITION- 17 07 52.23231(N) 061 48 11.98084(W)   ADJUSTED
 AB9557* NAD 83(1996) ELLIP HT-   -20.859 (meters)        (01/02/97)   ADJUSTED
 AB9557* LMSL    ORTHO HEIGHT -    17.3   (meters)       57.    (feet) GPS OBS
 AB9557  ______________________________________________________________________
 AB9557  LMSL orthometric height was determined with geoid model       EGM96
 AB9557  GEOID HEIGHT    -        -40.890 (meters)                     EGM96
 AB9557  GEOID HEIGHT    -        -40.961 (meters)                     EGM08
 AB9557  NAD 83(1996) X  -  2,880,786.639 (meters)                     COMP
 AB9557  NAD 83(1996) Y  - -5,373,393.793 (meters)                     COMP
 AB9557  NAD 83(1996) Z  -  1,866,705.265 (meters)                     COMP
 AB9557  LAPLACE CORR    -         -2.53  (seconds)                    DCAR97
 AB9557  HORZ ORDER      -  FIRST
 AB9557  ELLP ORDER      -  FOURTH    CLASS II
 AB9557
 AB9557.The horizontal coordinates were established by GPS observations
 AB9557.and adjusted by the National Geodetic Survey in January 1997.
 AB9557
 AB9557.The orthometric height was determined by GPS observations and a
 AB9557.high-resolution geoid model.
 AB9557
 AB9557.Significant digits in the geoid height do not necessarily reflect accuracy.
 AB9557
 AB9557.Click photographs - Photos may exist for this station.
 AB9557
 AB9557.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AB9557
 AB9557.The Laplace correction was computed from DCAR97 derived deflections.
 AB9557
 AB9557.The ellipsoidal height was determined by GPS observations
 AB9557.and is referenced to NAD 83.
 AB9557
 AB9557. The following values were computed from the NAD 83(1996) position.
 AB9557
 AB9557;                    North         East     Units Scale Factor Converg.
 AB9557;UTM  20      - 1,894,458.047   627,296.396   MT  0.99980036   +0 21 09.1
 AB9557
 AB9557!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AB9557!UTM  20      -   1.00000328  x   0.99980036  =   0.99980364
 AB9557
 AB9557:                Primary Azimuth Mark                     Grid Az
 AB9557:UTM  20      -  TAPA A                                   067 08 01.4
 AB9557
 AB9557_U.S. NATIONAL GRID SPATIAL ADDRESS: 20QPD2729694458(NAD 83)
 AB9557
 AB9557|---------------------------------------------------------------------|
 AB9557| PID    Reference Object                     Distance      Geod. Az  |
 AB9557|                                                           dddmmss.s |
 AB9557| AB9235 TAPA A                              APPROX. 1.2 KM 0672910.5 |
 AB9557|---------------------------------------------------------------------|
 AB9557
 AB9557                          SUPERSEDED SURVEY CONTROL
 AB9557
 AB9557.No superseded survey control is available for this station.
 AB9557
 AB9557_MARKER: DH = HORIZONTAL CONTROL DISK
 AB9557_SETTING: 66 = SET IN ROCK OUTCROP
 AB9557_STAMPING: TAPA C 1996
 AB9557_MARK LOGO: NGS
 AB9557_MAGNETIC: N = NO MAGNETIC MATERIAL
 AB9557_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 AB9557+STABILITY: POSITION/ELEVATION WELL
 AB9557_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AB9557+SATELLITE: SATELLITE OBSERVATIONS - 1996
 AB9557
 AB9557  HISTORY     - Date     Condition        Report By
 AB9557  HISTORY     - 1996     MONUMENTED       NGS
 AB9557
 AB9557                          STATION DESCRIPTION
 AB9557
 AB9557'DESCRIBED BY NATIONAL GEODETIC SURVEY 1996 (AJL)
 AB9557'THE STATION IS LOCATED IN THE COUNTRY OF ANTIGUA, AT THE V C BIRD
 AB9557'INTERNATIONAL AIRPORT AND SET IN ROCK OUTCROP NEAR THE APPROACH END OF
 AB9557'RUNWAY 07.  OWNERSHIP--COUNTRY OF ANTIGUA AND BARBUDA, V C BIRD
 AB9557'INTERNATIONAL AIRPORT, PO BOX 1051, ST JOHNS, ANTIGUA.  AERODROME
 AB9557'SUPERINTENDENT IS MR ERROLL GEORGE.  AIRPORT CONTACT IS CHIEF OF AIR
 AB9557'TRAFFIC SERVICES, MR ANTHONY MEADE, DIRECTORATE OF CIVIL AVIATION,
 AB9557'PHONE (809) 462-0358, FAX (809) 462-0642.  THIS IS A CONTROLED
 AB9557'AIRPORT, PERMISSION TO ENTER THE AIRPORT COMPOUND IS REQUIRED.
 AB9557'NOTE--AIRCRAFT TRAFFIC IS VERY HEAVY IN THE AFTERNOON.  TO REACH THE
 AB9557'STATION FROM THE SOUTHEAST SIDE OF THE TERMINAL BUILDING GO SOUTHEAST,
 AB9557'THEN SOUTHWEST ON THE APRON FOR 0.10 MI (0.16 KM) TO A CONNECTOR
 AB9557'TAXIWAY (A) ON THE LEFT (SOUTHWESTERNMOST OF 2) , CONTINUE AHEAD AND
 AB9557'GO SOUTHWEST ON A DIM TRACK ROAD FOR 0.6 MI (1.0 KM) (PARALLELING THE
 AB9557'RUNWAY) TO A WINDSOCK POLE ON THE LEFT, CONTINUE AHEAD AND GO
 AB9557'SOUTHEASTERLY ON THE DIM TRACK ROAD FOR 0.25 MI (0.40 KM) TO THE
 AB9557'STATION ON THE RIGHT.  THE STATION IS SET INTO THE HIGH POINT OF THE
 AB9557'NORTHWESTERLY END OF A 20 FT (6.1 M) BY 1.5 FT (0.5 M) ROCK OUTCROP
 AB9557'PROJECTING 0.1 FT (3.0 CM) ABOVE THE GROUND AND ABOUT 2 FT (0.6 M)
 AB9557'HIGHER THAN THE DIM TRACK ROAD, 163.3 FT (49.8 M) NORTHWEST OF THE
 AB9557'NORTHWEST EDGE OF THE RUNWAY (NOT THE PAVED SHOULDER) AND 8.0 FT (2.4
 AB9557'M) SOUTHEAST OF THE PERIMETER FENCE.  THIS IS A SECONDARY AIRPORT
 AB9557'CONTROL STATION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 20, 2026 21:20:07 EST
 AB9237 ***********************************************************************
 AB9237  DESIGNATION -  TAPH A
 AB9237  PID         -  AB9237
 AB9237  STATE/COUNTY-  AC/PARISH OF ANTIGUA AND BARBUDA
 AB9237  COUNTRY     -  ANTIGUA AND BARBUDA
 AB9237  USGS QUAD   -  
 AB9237
 AB9237                         *CURRENT SURVEY CONTROL
 AB9237  ______________________________________________________________________
 AB9237* NAD 83(2011) POSITION- 17 38 11.06285(N) 061 49 40.64394(W)   NO CHECK
 AB9237* NAD 83(2011) ELLIP HT-   -37.977 (meters)        (06/27/12)   NO CHECK
 AB9237* NAD 83(2011) EPOCH   -  2010.00
 AB9237* LMSL    ORTHO HEIGHT -     2.    (meters)        7.    (feet) GPS OBS
 AB9237  ______________________________________________________________________
 AB9237  LMSL orthometric height was determined with geoid model       EGM96
 AB9237  GEOID HEIGHT    -        -43.121 (meters)                     EGM96
 AB9237  GEOID HEIGHT    -        -42.279 (meters)                     EGM08
 AB9237  NAD 83(2011) X  -  2,870,581.734 (meters)                     COMP
 AB9237  NAD 83(2011) Y  - -5,359,890.448 (meters)                     COMP
 AB9237  NAD 83(2011) Z  -  1,920,061.411 (meters)                     COMP
 AB9237  LAPLACE CORR    -         -6.23  (seconds)                    DCAR97
 AB9237
 AB9237  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AB9237  Standards:
 AB9237         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AB9237            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AB9237  -------------------------------------------------------------------
 AB9237  NETWORK   10.30  16.31           4.76   3.29   8.32     -0.28072044
 AB9237  -------------------------------------------------------------------
 AB9237  Click here for local accuracies and other accuracy information.
 AB9237
 AB9237.The horizontal coordinates were established by GPS observations
 AB9237.and adjusted by the National Geodetic Survey in June 2012.
 AB9237
 AB9237.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AB9237.been affixed to the stable North American tectonic plate. See 
 AB9237.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AB9237
 AB9237.The horizontal coordinates are valid at the epoch date displayed above
 AB9237.which is a decimal equivalence of Year/Month/Day.
 AB9237
 AB9237.No horizontal observational check was made to the station.
 AB9237
 AB9237.The orthometric height was determined by GPS observations and a
 AB9237.high-resolution geoid model.
 AB9237
 AB9237.No vertical observational check was made to the station.
 AB9237
 AB9237.Significant digits in the geoid height do not necessarily reflect accuracy.
 AB9237
 AB9237.Click photographs - Photos may exist for this station.
 AB9237
 AB9237.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AB9237
 AB9237.The Laplace correction was computed from DCAR97 derived deflections.
 AB9237
 AB9237.The ellipsoidal height was determined by GPS observations
 AB9237.and is referenced to NAD 83.
 AB9237
 AB9237. The following values were computed from the NAD 83(2011) position.
 AB9237
 AB9237;                    North         East     Units Scale Factor Converg.
 AB9237;UTM  20      - 1,950,345.032   624,334.501   MT  0.99979113   +0 21 18.5
 AB9237
 AB9237!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AB9237!UTM  20      -   1.00000597  x   0.99979113  =   0.99979710
 AB9237
 AB9237_U.S. NATIONAL GRID SPATIAL ADDRESS: 20QPE2433450345(NAD 83)
 AB9237
 AB9237                          SUPERSEDED SURVEY CONTROL
 AB9237
 AB9237  NAD 83(2007)-  17 38 11.06185(N)    061 49 40.64921(W) AD(2002.00) 0
 AB9237  ELLIP H (02/10/07)  -37.962  (m)                       GP(2002.00)    
 AB9237  NAD 83(1996)-  17 38 11.06082(N)    061 49 40.65303(W) AD(       ) 1
 AB9237  ELLIP H (12/09/96)  -37.923  (m)                       GP(       ) 1 1
 AB9237
 AB9237.Superseded values are not recommended for survey control.
 AB9237
 AB9237.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AB9237.See file dsdata.pdf to determine how the superseded data were derived.
 AB9237
 AB9237_MARKER: DD = SURVEY DISK
 AB9237_SETTING: 0 = UNSPECIFIED SETTING
 AB9237_STAMPING: TAPH A 1996
 AB9237_MARK LOGO: NGS
 AB9237_MAGNETIC: O = OTHER; SEE DESCRIPTION
 AB9237_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AB9237+STABILITY: SURFACE MOTION
 AB9237_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AB9237+SATELLITE: SATELLITE OBSERVATIONS - 1996
 AB9237
 AB9237  HISTORY     - Date     Condition        Report By
 AB9237  HISTORY     - 1996     MONUMENTED       NGS
 AB9237
 AB9237                          STATION DESCRIPTION
 AB9237
 AB9237'DESCRIBED BY NATIONAL GEODETIC SURVEY 1996
 AB9237'NO TEXT AVAILABLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 20, 2026 21:20:07 EST
 AB9238 ***********************************************************************
 AB9238  DESIGNATION -  TAPH B
 AB9238  PID         -  AB9238
 AB9238  STATE/COUNTY-  AC/PARISH OF ANTIGUA AND BARBUDA
 AB9238  COUNTRY     -  ANTIGUA AND BARBUDA
 AB9238  USGS QUAD   -  
 AB9238
 AB9238                         *CURRENT SURVEY CONTROL
 AB9238  ______________________________________________________________________
 AB9238* NAD 83(2011) POSITION- 17 38 11.91959(N) 061 49 23.88778(W)   NO CHECK
 AB9238* NAD 83(2011) ELLIP HT-   -36.104 (meters)        (06/27/12)   NO CHECK
 AB9238* NAD 83(2011) EPOCH   -  2010.00
 AB9238* LMSL    ORTHO HEIGHT -     4.    (meters)       13.    (feet) GPS OBS
 AB9238  ______________________________________________________________________
 AB9238  LMSL orthometric height was determined with geoid model       EGM96
 AB9238  GEOID HEIGHT    -        -43.168 (meters)                     EGM96
 AB9238  GEOID HEIGHT    -        -42.322 (meters)                     EGM08
 AB9238  NAD 83(2011) X  -  2,871,014.216 (meters)                     COMP
 AB9238  NAD 83(2011) Y  - -5,359,651.774 (meters)                     COMP
 AB9238  NAD 83(2011) Z  -  1,920,087.080 (meters)                     COMP
 AB9238  LAPLACE CORR    -         -6.44  (seconds)                    DCAR97
 AB9238
 AB9238  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AB9238  Standards:
 AB9238         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AB9238            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AB9238  -------------------------------------------------------------------
 AB9238  NETWORK   12.16  40.53           5.08   4.83  20.68      0.17009941
 AB9238  -------------------------------------------------------------------
 AB9238  Click here for local accuracies and other accuracy information.
 AB9238
 AB9238.The horizontal coordinates were established by GPS observations
 AB9238.and adjusted by the National Geodetic Survey in June 2012.
 AB9238
 AB9238.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AB9238.been affixed to the stable North American tectonic plate. See 
 AB9238.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AB9238
 AB9238.The horizontal coordinates are valid at the epoch date displayed above
 AB9238.which is a decimal equivalence of Year/Month/Day.
 AB9238
 AB9238.No horizontal observational check was made to the station.
 AB9238
 AB9238.The orthometric height was determined by GPS observations and a
 AB9238.high-resolution geoid model.
 AB9238
 AB9238.No vertical observational check was made to the station.
 AB9238
 AB9238.Significant digits in the geoid height do not necessarily reflect accuracy.
 AB9238
 AB9238.Click photographs - Photos may exist for this station.
 AB9238
 AB9238.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AB9238
 AB9238.The Laplace correction was computed from DCAR97 derived deflections.
 AB9238
 AB9238.The ellipsoidal height was determined by GPS observations
 AB9238.and is referenced to NAD 83.
 AB9238
 AB9238. The following values were computed from the NAD 83(2011) position.
 AB9238
 AB9238;                    North         East     Units Scale Factor Converg.
 AB9238;UTM  20      - 1,950,374.433   624,828.159   MT  0.99979265   +0 21 23.6
 AB9238
 AB9238!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AB9238!UTM  20      -   1.00000568  x   0.99979265  =   0.99979833
 AB9238
 AB9238_U.S. NATIONAL GRID SPATIAL ADDRESS: 20QPE2482850374(NAD 83)
 AB9238
 AB9238                          SUPERSEDED SURVEY CONTROL
 AB9238
 AB9238  NAD 83(2007)-  17 38 11.91859(N)    061 49 23.89306(W) AD(2002.00) 0
 AB9238  ELLIP H (02/10/07)  -36.090  (m)                       GP(2002.00)    
 AB9238  NAD 83(1996)-  17 38 11.91756(N)    061 49 23.89688(W) AD(       ) 1
 AB9238  ELLIP H (12/09/96)  -36.051  (m)                       GP(       ) 1 1
 AB9238
 AB9238.Superseded values are not recommended for survey control.
 AB9238
 AB9238.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AB9238.See file dsdata.pdf to determine how the superseded data were derived.
 AB9238
 AB9238_MARKER: DD = SURVEY DISK
 AB9238_SETTING: 0 = UNSPECIFIED SETTING
 AB9238_STAMPING: TAPH B 1996
 AB9238_MARK LOGO: NGS
 AB9238_MAGNETIC: O = OTHER; SEE DESCRIPTION
 AB9238_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AB9238+STABILITY: SURFACE MOTION
 AB9238_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AB9238+SATELLITE: SATELLITE OBSERVATIONS - 1996
 AB9238
 AB9238  HISTORY     - Date     Condition        Report By
 AB9238  HISTORY     - 1996     MONUMENTED       NGS
 AB9238
 AB9238                          STATION DESCRIPTION
 AB9238
 AB9238'DESCRIBED BY NATIONAL GEODETIC SURVEY 1996
 AB9238'NO TEXT AVAILABLE.

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