in the water?
LOL
if you really want to KNOW, open the mission builder, and open the campaign-RND file or the Camaign SCR file
Other than that, i can tell you that in the early months of 1940, there is a lot of action (and i really mean a LOT) when the germans invade Danmark and Norwegen.
The Northern Sea between UK and Norvegen is a good place for hunting at that moment. lots of cruisers and BBs to be seen.