I agree with the below posts. You'd have to know exactly where the GPS transmitter was, have a receiver sensitive enough to get a reliable signal from that transmitter, and software which could triangulate that far "out of the box", so to speak.

And you'd need something upon which to project the location, or describe the location.

My Garmin 76 CSx would not to it, I'm afraid. It has some trouble locating itself if I move it a few hundred miles from its last "fix", and it needs a map or chart upon which to place the pointer.

I'm afraid the pointer just placed into empty space wouldn't tell anyone much.

Arf