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Originally Posted by Castout
Under the right conditions a carrier may be detected acoustically well in excess of 140 miles, or may not be identified at all until it's in visual range. Assuming the carrier is detected at 140 miles, can the operator classify it as a carrier? Maybe, maybe not.
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This might be kinda geeky but a US carrier is quite distinct because it has more screws than any other ship. It's probably a bad example, but you're right in the sense that sonar ranges could be chosen at random and you might do as well as the one trying to nail it own to the smallest detail. So much depends on variables that might not be known at all, or if they are known it's only imprecisely.