The coordinates are shown on the upper right and the radar is on the lower left. They aren't really used together. The radar will tell you what kind of spaces are around you (once you get the first upgrade). The type of terrain is shown using the first letter of the type of terrain that it is i.e. C for Crater, D for Dunes, S for Settlements, O for Outpost.
Yeah, I know this one. I just wonder what those coordinates means...