Going off of SH4 uboat expansion
Black Line = Merchant
Blue Line = Warship
(This is kind of fuzzy in SH5. I've run into some armed merchants that come up with Warship contact lines)
Green line = Radar contact
(Haven't gotten far enough in SH5 to see if that's in or not)
As far as a visual contact, you won't get a sonar line on it. Watch crew will "see" it and it will be shown on your map. Gray circle that emanates from a visual contact is their sight line. If you're in the gray circle they can see you and will start evasive maneuvers or firing if they have a gun. You can effect their visual by the position of your boat. If you're running the same direction and have a full broadside view of you they can see you better. If your 90 degrees to them and have only your bow shown to them they'll have a tougher time spotting you.
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