1. Water clarity: Any divers out there? Water clarity should be turned way down, if you want any kind of realism. Seeing any further than the tip of your U-boat is fairly unrealistic in most circumstances, especially at night or anywhere near rivers, harbours, sand banks, shallow waters, high-current waters, waters with high tide differences, etc.
2. Radio silence: the Brits will detect you with HF/DF(called "Huff-duff") radio emission detectors. That's what those big masts on the destroyers are for; to capture your radio signals. Unfortunately, you are under orders to report any convoy contacts immediately to BdU. It's all for the Greater Good.
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