Some of the others have mentioned the time compression notification and that is what I use. I try to only use the snorkel at night and I have the attack periscope raised pointing at 0 bearing and the observation periscope raised and pointed at 180 bearing. I rarely go above 32x compression and when I see it all of a sudden drop to 8x compression I know that something is nearby (either a ship or a plane). I just pretend this is my notification from the scope operators or hydrophone operator and I go down to a deeper depth and listen for any ships or splashes in the water.
Thanks,
Ron
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