Hi Fumar, which game are you using? If you're using MegaGlest, and I think also on GAE, you can disable the darkness which covers the unseen part of the map. The names of these options differ, but you can set it when you setup a new game.
In the future (you most likely could not know this, yet), please ask your engine related questions in the very subforums of these engines (MegaGlest or GAE).
Thanks.