If the ship spotted is any enemy ship such as a merchant or warship, TC will drop to 1. The notable exception is Sampans and Junks. If these ships are spotted, the game will ignore them as far as dropping from TC, but will still spot them. Sonar in TM is not enabled while running on the surface (not entirely realistic, as sonar heads on the bottom of the boat could detect ships at moderate range at low surface speeds, but its there anyway)
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