Haha, Iv been wondering this same thing myself. It often seems that the peri/sub sighted messages are related to the contact reports you get that show you ship/convoy/task force on your nav map. Often times it seems like you will get sub/peri sighted messages whos cordinates lead you right to these "contact reports" on the nav map. Even hours later, when the contact mark on the map is nearly faded away, and whoever was there at the time should be long gone, I will still get sub/peri sighted messages with cordinates leading right to them, seems strange.
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