its a bug.
i noticed it the other day when i gave the order to the sonar man to track a warship.
after i surfaced he continued to track the ship providing accurate data with relation to bearing and speed etc.
the weather for me was perfect calm.
it was not an issue of dipping below the water line with the receiver
test this out someone.
order the hydrophone operator to track a merchant or warship and then surface... he will keep tracking it
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