This is the worlds first and probably only FLOSS project aimed to create a lowbudget, based on availble technology, cruise missile. No this is not a Joke, its for real. Why? Since no one has tried to do this before and certainly not under the GPL.
UTANAV is a GPS and digital compass assisted map navigation system currently running on the PIC18F4520 micro-controller by Microchip(TM). It is written in MPLAB assembly.
Attitude - GPS/INS integration with emphasis on remote sensing applications