An Add-on that changes the starmap rules: you only know planets that actually see. Normally, you see all planet positions without ever having been there. With ExploreMap, you have to be in scan range to see a planet on your map. Obviously, this makes only sense when you are playing on a custom map.

This is a testing version.
It may be incomplete, and have more bugs (or features) than the public live version at planetscentral.com.