@ tyler monkey : ah ok, i messed this up , you are right it will be the watertight housing rating.
but nevertheless i,m wondering if its even theoretically possible to get a signal from the waterdepths in this region by a small handheld locator.
when yes, forget the navy towed locator, forget the uk nuclear trafalger class sub - the chinese do it with a zodiac and a teledyne benthos !
