Hi, maybe I am asking in the wrong group (this is a group for GPS users, and not developers?), but I would like to know something of the GPS basics. In fact I would like to calculate the distance and angle between 2 GPS coordinates (or position in a x-y diagram, where one coordinate is (0,0)). (starting from the NMEA-string, result should be meters). I would be very happy, if somebody here could point me to some good ressources. Matthias