Re: Wztching for surface traffic (was: Submarine Movie? or TV?)

[Michael B Holt <michaelbholt@juno.com>]

On Sun, 4 Jul 1999 17:33:47 EDT VBra676539@aol.com writes:
>No, but it would need to be directional to make any difference. You 
>can hear an outboard for a long way from u/w already.

How difficult is a directional acoustic sensor?   

My first thought -- I had this one when I was a teen, a long time ago
(well,
not that long) -- was to have two microphones.   One would point upwards 
and the other would be aimed in any horizontal direction.



Michael B. Holt
Oregon Hill, Richmond, Virginia, U.S.A.
-- 

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