PORTS
Pros:
Can repair damaged ships.
Can refuel ships and give down time to crew, giving ships +1 movement for a turn.
Can protect ships by having an AA gun.
Can protect ships by not allowing enemy ships inside.
Cons:
Ships can not evade enemy fire, bombs, or torpedoes.
Ships are in a state of Unreadiness, meaning they are not prepared for battle; things like water locks and seals were open, ammunition was on the decks being moved, armored doors were not shut.
Crew and Aircraft may not be present on board ships, and are not fueled nor ready to go into battle.
This should be represented in one or more of the following ways: (and they can only be attacked by aircraft while in port)
All ships and aircraft in port can not fire in the first round.
All ships and aircraft in port fight at -1 in combat rolls.
All aircraft attacking the port fight at +1 in combat rolls.
All battleship and carriers in port have only 1 hitpoint.
Personally, I would have it as:
“All ships and aircraft in port can not fire in the first round of combat”
and
“Only aircraft may attack ships in port”
I think that would be historical and good gameplay.