Next message: Walter Knopf: "Re: lv-ab: "Prper Watch""
-----Original Message-----
From: Philip
As far as watch keeping aids are concerned I would think that a passive
sonar unit would be just the ticket. Sound travels faster and further
underwater than in the air and a ship of fishing vessle would be audible for
some distance.
Any one hear of such a thing for small boats?
REPLY
Well we did use them for the "small warships" called corvettes during
the last war. We called them ASDIC
Essentiually it was a directional hydrophone which cluld be rotated by a
steering wheel from the control station.
<VBG>
Arild
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