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At least my immersion will be helped with knoweldge that the pericscope will identify aircraft and it will show plotted on the map - correct?
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With map contacts on, aircraft will appear as triangle icons on the map screen at a range of about 5000m give or take. No audible or text warning is provided, the icon appears and you see it and react or miss it and probably die.
Not all aircraft detected visually will spot you, occasionally they will fly past without detecting you.
In the map screen, the periscope view is 360*, I visually check sea and sky when reaching snorkel depth (part of the Captain's job description) and then go to the map screen, zoomed to the 2500m scale, raise the snorkel and when the charge battery icon lights up, go to Ahead 1/3 and put the batteries on charge. This gives a speed of about 5-knots in typical sea states.
Aircraft are not identified by type unless you first select it and then ask the WO for target identification. This is a guess, I never bother; the merest detection of an aircraft is enough for me to lower all masts, crank on the amps and dive, generally doing a turn 90* towards the bearing to the aircraft. Have found that turning towards the contact is generally better than turning away because it seems that they will tend to drop ordnance behind you, usually far enough for you to avoid damage.
I do not make a radical course change when a mast-mounted sensor detects a radar signature although the ESM line provides a bearing to the emitter. No German RWR provided bearing information to my knowledge so without this info, executing an evasive course seems wrong.