Hope this helps.
1) The Navigation map can be expanded to cover the entire pacific plus. The Attack map will show torpedo plots and track them once fires; depending on the realism setting and mods, it will also show ship silhouettes and where your own TDC clculation places the targetted ship.
2) The observation periscope is a wide angle tool, where the attack periscope is linked to the TDC, etc.
3) Do not think you can change whilst in mid patrol, becuase after setting the realism myself and then installing some mods I found that the realism setting had been altered and I cannot seem to change it back whilst on patrol. Hopefully, one can do that whilst back at the office. (asking that question on another thread myself).
As I said hope it helps.
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