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Originally Posted by Grayson02sept1980
thing is... I hear it but cannot choose what it is... the dragdown or whatever thing to say "freighter" "Warship"
I HEAR it yet cannot "mark" it...
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The contact has to be real close for your hydrophone guy to identify it. Listen to the sound of the props and eventually you'll be able to make an educated guess of its identity yourself. High speed, high frequency is usually a warship; low speed, low frequency is usually a merchant. There are also some prop sounds from small coastal ships you'll want to ignore like tugs and fishing boats.