Great idea Kai, using a gps receiver solves the problem of sand, dust and gung collected on the sensors after a short trip in the desert.
GPS receiver gives the speed as well as position and time, etc...
Unfortunately I only received the pcb today,
I'm soldering the components now and hope to test drive it tomorrow, I still have to test the speed generated from proximity sensor and see if I can get away by setting the break speed higher to save cost.
Regards
Mahmood