[Wacka]

GPS can work, unlike stated in your post. As long as the batteries in the hand held receivers are working, they will work. The signals come from satellites. There might not be any landmarks, but the coordinates don't change.

[SlowBoat407]

GPS can work, unlike stated in your post. As long as the batteries in the hand held receivers are working, they will work. The signals come from satellites. There might not be any landmarks, but the coordinates don't change.

Amen to that. In fact, that is when it really shines. It showed its usefulness during Op Desert Storm when troops went barreling through the desert with only GPS to guide them.