The only cam that does that is the free cam. You can find it in the bar in the top of your screen that appears when you mouse over it. You see a captain's hat, a conning tower, external view, next unit and previous u it icons.
Click on the Free camera (conning tower icon) you can now flow the boat and use all camera keys, WASD and the numpad keys to move the camera around.
Note! The freecam darkens itself (in my game) I have not yet found out why and it seems that the mod-Gods also do not know why not can they change it.
Best,
Ashi.
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