They have GPS libraries for Arduino which are fun to play with but not too easy for some one like me to try and make a UGV with. I think it would be a cool idea for diy drones to have code that would just give like distance to your next GPS point and heading needed. You know, a code without all the sensors and outputs but with just the part in figuring out what is needed to get to the next GPS point. I do not know if i am the only one who would like this but there might be others. Or is there is simple mod for some of the current code that could do this?