On some fields, there are "compass fly buttons" that are unmarked, in the NW, SW, SE, and NE, corners. These will also start you on a runway.
Also, the "compass fly buttons" at vehicle hangars will spawn you some distance from the hangar, fairly close to a nearby field. Try launching a vehicle offline, then immediately check the map to see where you are.
Remember that the red/green bars indicate the NUMBER of enemies/friendlies in a sector -- NOT their position. The small radar dots indicate position.
popeye