This week, National Geodetic Service (NGS) representatives rolled out the latest work on the Gravity for the Redefinition of the American Vertical Datum (GRAV-D) Project to the international community at the 25th General Assembly of the International Union of Geodesy and Geophysics (IUGG) quadrennial meeting in Melbourne, Australia. GRAV-D is an ambitious effort to move towards a unified height reference system for all of North America. In addition to making announcements about GRAV-D, NGS also engaged in meetings to discuss international efforts to adopt a world height system. This quadrennial meeting brings together eight of the largest professional organizations in the earth sciences for two weeks to discuss the latest research in a variety of fields. For more information, contact Dru Smith.