Enemy AI detection ranges are highly dependent on which mods you are using; especially environment mods.
The settings sim.cfg file are also a huge factor in enemy visual detection. I would say if you're curious about your aspect ratio and speed will effect it, take a look at the Enemy Surface Factor and Enemy Speed Factor under the Visual block.
WARNING: This could possibly be a spoiler for how you play the game. View at your own risk.
3X WARNING: I highly recommend not fiddling with any of these settings for your game (don't ask why I know this). The excellent modders who set those settings did so for a very, very, very good reason....
Anyway, for NYGM at least, both aspect and speed are HUGE in staying unnoticed. I've been able to get crazy (~1000m close to escorts even while they're alerted to me (torpedo impacts) minding my speed and staying bow/stern on. The sea state seems to be very much secondary to speed and aspect, though. A lot of my failed convoy approaches happen in rough seas, not calm, because I think I can go faster.
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