Most naval battles occurred within a very short span of time over long distances. Simulating this on the WarPlan scale of 2 weeks is a difficult task. Consider the map following the Bismarck and the Prince Eugen. This whole engagement took just 1 week from the day the left port to the day the battleship was sunk. It took half the British navy to find her at sea. Another example is the Japanese attack on Pearl Harbor.
The movement and attack on Pearl Harbor took 11 days crossing 140 hexes WarPlan hexes of map distance. The complexities of recreating realistic scenarios are a challenge to say the least.