i think that would be a pretty neat idea, but there might be a couple of problems with it. the gps kinda needs a clear shot of the sky to get a good lock on the satellites, and mounting it there wouldn't allow for that. also, like Kmvreter said, you would have to look down to see it. that would be a pain and dangerous. it'd be cool to see it done, though, so go ahead and try it and let us know how it goes!