English GPS determines the position of a vessel by comparing signals from several transmitting satellites in medium earth orbit (MEO). Differential GPS (DGPS)
File:GPS_Satellite_NASA_art-iif.jpg licensed with PD-USGov-NASA 2006-02-09T20:20:11Z Michaelfavor 1006x806 (113573 Bytes) Artist Interpretation of GPS satellite
File:GPS_Satellite_NASA_art-iif.jpg licensed with PD-USGov-NASA 2006-02-09T20:20:11Z Michaelfavor 1006x806 (113573 Bytes) Artist Interpretation of GPS satellite
