Question regarding the hydrophone abilities of english destroyers:
Picture shows a situation from Sept. 18th 1939, 1:40 at night, in Scotish coastal waters, from a youtube-Let's-play-video (
at ca. 10:00min)
It shows 2 destroyers A and B with some detection ranges of ca. 3 or 4 km radius.
1) Are these the hydrophnoe ranges?
2). I would have assumed a not-moving destroyer has a hydrophone range of 10 - 19 km. Destroyer A is not moving, even though he has the same detection range as the destroyer B.
Why are the hydrophone-abilities of destroyers are that different from an u-boat ?
3.) Any links to read something about the hydrophone abilities of the Allied war ships in SH5?