NGS encourages anyone with survey-grade Global Positioning System (GPS) receivers to join the 2014 GPS on Bench Marks Campaign, a National Surveyors Week (March 16-22) event to raise awareness about professional surveying while improving the National Spatial Reference System (NSRS).

Why Participate?

The nation’s height system, the North American Datum of 1988 (NAVD88), is founded on historic geodetic leveling surveys on thousands of bench marks that are often difficult and expensive to access. By adding GPS coordinates to these marks, the height system can be modeled in GPS survey systems for easier access. The latest hybrid geoid model, GEOID12A , includes many “GPS on bench mark” observations, but would benefit from additional data collection in many areas

Click here to find out how to participate!