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Originally Posted by sasquatch
Amazing thread 
Querry - does passive sonar have a difficult time picking up your u-boat when its at periscope depth? |
Sea state does indeed have an effect on hydrophones. (passive sonar)
It also has an effect on active sonar, but not nearly as much.
Are you safe at periscope depth?
Well, that depends on what you are doing, and the sensor in question.
If you are running around at flank speed and making lots of noise...
... yer gonna DIE!!!
Sneak to survive!
Read "Appendix C" in the GWX manual... and the 1943 Edition U-boat Commander's Handbook as translated by the U.S. Navy.
(With the latter you must listen to what is NOT being said to understand why different matters are important. The handbook sells cheap on Ebay. Got mine for six dollars.)