HQ's and Cities have Object Types of Group Master. CV's are a little different. When you first add them to the map, mark them as Group Master. The individual ships within the CV Group will have Object Types of Ship. The idea behind the Group Master is there is one object, like a field or HQ which are actually shapes, that is made up of individual objects such as Ammo Bunkers, Fuel Bunkers, Hangers, etc. Using Group Master will allow the individual objects to retain their own unique object type. The CV Group is actually a Group where you can get to the individual items or ships.
Also, CV Groups should be left pointing north. The game engine will turn them to follow the waypoints.
