Ideally I would love to get a single illustrator file (or other vector format to be imported by illustrator), that I can then save to various sizes, but if that's not possible, separate photoshop files would be great also.
I took a stab at it myself (see attached black/blue/green sketch). I like the simplicity of this and the fact that it conveys a latitude/longitude coordinate, but I think it looks too much like a game icon because it's on a black background. I would like you to make it look more like a utility app icon, rather than a game. Maybe this means moving to a lighter background.