The map room is indicated by a small yellow box in close proximity to a base. In an airfeild there is a town nearby, and the maproom will always be smack dead in the center of town. On a vehicle base the hangers are referred to as Main pad, Offset, and Maproom. If you spawn out of the main pad hanger, "which you always do at the vbase" the maproom is to your right next to the right hanger in regards to the main hanger.