Not 40 miles with the WWII hydrophones... I would think something like 8-10 nautical miles is what you can expect by good weather, which is already a lot more than eye sight, specially considering that in SH3 you have a lot more time with heavy/medium/light fog than with no fog at all...
PS : whales with their personal original mk1 "hydrophones" can communicate over 100s of miles in the low frequencies.
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NYGM 3.4A / Living SH3 V5.1 + SH3 Commander
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