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Originally Posted by JU_88
I suppose there different factors to consider, an escort watch crew have better visibility that a uboat watch as they have the advantage of elevation. However a uboat has a relativly small profile and doesnt produce a smoke stack, so its a close call as to who would spot who first, of course once you throw radar in to the equasion, its a whole differnt ball game. :hmm:
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I live in a town by the sea, and with a glass sea (no waves or very small ones), you can spot a zodiac type boat at 3 or more km bare eyes, sometimes is not the size of the object, but it's reflect/color properties in contrast with the ocean, the same applies to planes, depending on the circumstances you can spot an airplane at 10 km or more because it's reflections.
Ref