Yup, as was stated, with stock SH3 and map contacts on the sonar is basically an unreaslistic underwater radar system.
The lines radiating out from your position indicate the direction to the contact and the position is at the end of the line.
As I recall, warships have red lines and merchants have black? It's been a long time since I played stock.
When you get the radar detectors, they work the same way. In fact, radar detections function much, much, much better than your own radar. They have a longer range and don't give away your position.
The only time you will get an icon on the map representing a contact is when you see it or your crew sees it. Sometimes you can see it through the periscope but it won't show on the map. Press L to lock to it and it will stay on the map for a few seconds. You can actually lock to targets you can't actually see due to weather and then go see them on the map. That's a cheat, of course.
Steve
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