By eye- maybe 12 mi.
By radar- in theory about 24 nautical mi (but subs are low in the water and choppy seas can hide them almost all together. Under normal conditions 1941, 6 to 10 N.mi.
Passive sonar- sub on surface using engines about 12 N. miles, submerged on electric motors but not silent running 3 to 5 nautical mi. It can tell direction but not range. Active sonar is needed to determine range.
These are only rough figures and conditions could make it much shorter ranges.
References that may help:
http://en.wikipedia.org/wiki/36th_Es...8Royal_Navy%29
http://en.wikipedia.org/wiki/Battle_...2%80%931945%29
http://www.uboat.net/index.html
http://www.convoyweb.org.uk/index.html
As to knowledge base; I know a lot more about subs than I do about escorts so don’t feel so alone.
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