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After completing the lesson, the learner should be able to do the following:

• Perform the appropriate office planning and field reconnaissance for a successful GNSS project;
• Select the appropriate published stations and CORSs for incorporating your new stations into the NSRS and handling tropospheric effects;
• Select stations with good sky visibility for estimating accurate coordinates, taking into account current and future environmental conditions;
• Develop a project observing plan that includes travel time between stations;
• Recall the reasons why performing a careful office planning and field reconnaissance at the initiation of the project will save resources and make the field and office operation much more efficient.

National Geodetic Survey, NGS, survey, surveying, GNSS, GPS, geodetic control, continuously operating reference station, CORS, survey station, survey mark, benchmark, recovery, position, accuracy, precision, datum, epoch, hub, tropo, National Spatial Reference System, NSRS, obstruction diagram, antenna, antenna calibration, antenna reference point, ARP, log sheet