How fast can it go ? With some simple rules, it is possible to achieve relatife high speeds with a GPS Rover :
Rule nr 1 : Aim for the Waypoint (obvious).
Rule nr 2 : Switch over to the next waypoint is a function of speed : high speed = switch over at high distance !!
Rule nr 3 : Proportianal gain steering is a function of speed, higher speed = lower gain !
Rule nr 4 : Speed is function from up coming waypoint, if approaching sharp corner , lower the speed !
All these rules are mainly for compensating the GPS / System lag.