Automatic Map Updates

Originally Posted by Sailor Steve

As Randomizer said, if you leave the scope up they will warn you automatically, it Map Contact Updates is turned on. With the Assisted Plotting Mod you may not see them, but you'll still get the warning and have time to dive.

Are you certain this is the case?

Have found that even with map contacts on you receive no warning whatsoever when aircraft become visible with the periscope up nor does TC drop to x1. When an aircraft icon appears, you need to manually reduce TC and take evasive action. This is the reason for the high map screen zoom and low TC when snorting.

I expect this is because the game cannot place crew member at the periscope to actually sound an alert but could well be wrong.

Since I don't use the Assisted Plotting Mod, perhaps someone who does can set up some test runs, snorkeling with the scope up, to confirm Sailor Steve's observation.