If someone is still interested: Position lights (on both sides of the tower, at it's rear side and that one far aft) were only used in own waters after being overtaken by the escorts, mine sweepers or other units patrolling at u-boat bases. When in action, they were always off duty (as well as the life-buoys at both sides of the tower).
The flag was only raised when coming to or being in port and leaving it. As soon as land was out of side, the flag and the flag pole were removed and brought under deck (therefor the flag pole shouldn't be on the 3D-modells as well as those two life-buoys). The morse lamp (named "Varta-Lampe" after it's builder) as seen in "Das Boot" of course was always aboard for communication with other units at sea.
Regards;
thoomsn
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