Stopping the boat underwater in real life near the enemy at periscope depth is a recipe for disaster. A U-boat needed momentum for effective depthkeeping. The exception is the trick of “hanging the boat by the scope”, which was more of a parlor trick, if anything, and possible only in very calm seas. Certainly not something to risk near the enemy.
Correct on U-Jagd. “U-Jagd” means ASW in German. This watch was for timing closure rates for attacking a submerged sub with depth charges. I happened on the MDv for U-Jäger vessels a couple years ago and the watch’s use is fairly well described there.
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