Map Lines

[Boris]

Originally Posted by trenken

Oh, and how can I possibly intercept what is on the other end if I don't know anything at all about it and can't see it? Do you guys usually ignore these?

these lines represent your sound contacts and you only get them underwater. I always thought the colour did represent friend or foe, but this doesn't matter to me anyway, as all realism mods I have used in the past make all these lines black anyway.
I assume you're not using Improved Uboat or Real Uboat? It's totally unrealistic to be able to identify the hostility of a ship by sound anyway.

Basically these lines are useful to tell you where ships are when you're below periscope depth. They will keep updating every so often, and if you keep marking the end of the line you can see which direction ships are going.