What is DGPS?
DGPS is a method of improving the accuracy of your receiver by adding a local reference station to augment the information available from the satellites. It also improves the integrity of the whole GPS system by identifying certain errors. • Q: Why would I need one? A: You might not, but if you want to improve accuracy beyond what is available for a consumer grade GPS receiver or want to improve integrity by knowing when to believe the receiver, one of these solutions may be right for you. • Q: Just how accurate is my GPS receiver any way? A: Most GPS manufacturers quote 17 meters (49 feet) as the accuracy of horizontal positions anywhere on earth. However, independent testing has shown that modern receivers can achieve 10 meters fairly reliably with a clear sky view. • Q: But my receiver reports errors much less than that. Do I have an exceptional unit? A: A GPS can only estimate the accuracy and many manufacturers are a bit optimistic in the numbers they quote. To be more precise the
