Yes taking a dip for 10 to 20 minutes occassionally might reveal distant contacts you would otherwise miss.
Believe it or not you can hear them alot further than you can see them.
What I do is dip to or below periscope depth, If I pick up a sound contact I will mark it on the map, surface and sail in the general direction of the contact for an hour or so then dip again and make a second mark. With the two marks you can determine course and approximate speed making it easier to intercept them.
Here is a question. If you play without map contacts do the ... uh... sound lines still show up?
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