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Originally Posted by Camie Jarlson
But I thought we were able to use passive sonar for ship identification in Narrow Band signatures also. Isn't that useful enough, so that you won't have to raise the periscope for positive ID at all?
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Maybe. The presence of other shiping in the area muddies the issue, though. There's a chance that his signature might be obscured by intervening traffic, or that you might confuse one target for another of a similar type. Also, depending on the acoustics, you might not be able to get enough tonals to really make that guess with enough confidence to shoot. There's also the fact that associated with one's firing solution there's always an area of uncertainty, which might be quite substantial.
One COULD make the shot just using their sonar, but it'd probably be better just to quickly make one check on the periscope before shooting.