The average position value for each station was compared to the known value for that station. Arbitrary decision not to collect data. This evaluation produced an average real-time DGPS horizontal position error of 0.48 meters, and an elevation error of 0.62 meters. At the Nelson station, where only 94 position records were averaged, the horizontal error was 1.13 meters and the vertical error was 1.21 meters. Averaging more than 94 real-time position records, but fewer than 300 records, may produce submeter accuracy.
Further testing is needed.
The base station used for postprocessing was a single-frequency receiver that relies on an algorithm. Both factors could account for the poor performance of the postprocessed DGPS results. The Continuous Operating Reference Stations are located only along the coastline and major waterways. They do not cover much of the National Forests. Other real-time DGPS services are available on some local FM radio stations, but the broadcasts are easily attenuated by terrain.