How accurate is VBOX when measuring position?
The standard positional accuracy of VBOX’s is 3M 95% CEP for Longitude and Latitude. The height accuracy is 6M 95% CEP. CEP = circle error probable. 95% CEP means 95% of the time the position readings will within a circle of diameter 3M of the true position. This error is due to the changing state of the ionosphere, constantly changing the time taken for the satellite signals to reach the earth, see GPS Errors and Noise. The accuracy of the positional and height data can be improved using different types of Differential GPS correction methods, see Differential GPS.
