Wikipedia article [1] states that differential GPS can provide up to 10cm accuracy. Differential GPS works by having a local GPS receiver station which locatio

Wikipedia article [1] states that differential GPS can provide up to 10cm accuracy. Differential GPS works by having a local GPS receiver station which location is well known. This station is comparing the location determined from the GPS signal to its known location, calculates necessary corrections and sends the information to other GPS receivers. [1] http://en.wikipedia.org/wiki/Differential_GPS http://en.wikipedia.org/wiki/Differential_GPS