By listening to the propeller sounds.
Depending on the ship, you can find out the speed by how many revolutions the propeller(s) make per minute.
Quote:
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Originally Posted by The Hunt by Dantenoc, pg. 11
Head to the hydrophone and listen to the target.
CHUG-chug-chug-chug CHUG-chug-chug-chug CHUG-chug-chug-chug...
his four bladed propelar turns 28 times per minute. For a C2 that kind of engine effort translates into 7 knots. Speed confirmed (if this was way over your head don't worry, there's an excellent academy mission download for training yourself in the use of the sonar, done by Grayrider and Captain Nautilus I beleive).
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