If you move the sonar arrow with your mouse cursor you should hear the ship and see the green light come on down that bearing, just focus in on that bearing to ping, wait for return and send to tdc....the rest are in the tutorials. Seems they was a good sonar only thread posted recently either here or in mods.
You can also use the deckgun basically the same way, just shoot the gun down the sonar bearing, when you score a few hits it will catch on fire and easy to see.
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