.Map :: MoHAA Mapping

I always lost the map in the 3D-View, no matter how hard I click the mouse, it wouldn't appear in the center again. So I had to restart the Radiant to make it in normal.

Is there some hotkey to return it to the center in the 3D-View?

Click in the 3d view and press the end key to level your view . Then in the 2d view click the middle mouse button while holding the control key to move the camera near the brush you want to see , then press the middle mouse button ( no control key ) on your brush and the camera will turn to face where you middle clicked .