[Public-list] depth sounder puzzle
harmony at aztec-net.com
Sun Jul 1 21:06:48 PDT 2007
Maybe it was like in the old WWII submarine movies. There was an area in the creek where there was a boundary layer of water with drastically different temperatures or salinities and the sonar got a false echo.
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----- Original Message -----
From: Gordon White
To: public-list at lists.alberg30.org
Sent: Monday, June 25, 2007 5:48 PM
Subject: Re: [Public-list] depth sounder puzzle
I was out this weekend for the first time this season and everything
seemed to work o.k - depth sounder, speed meter, auto pilot, etc. The
depth sounder has always been a foot on the conservative side - reads
six feet where there are actually seven from the surface. I checked this
in the slip with a pvc pole with a small plate on the end so it does not
go down in the mud and mislead me - Everything was fine.
The depth readings just outside the slip were fine - 4.5 to 6 feet
(actual depths 5.6-7) but about 150 yards down the creek the depth
sounder began reading 1.5, 2. 1.5 feet. etc. Obviously it's not that
shallow or I'd have been pretty hard aground. The actual dept in that
stretch are 5.5 - 8 feet at that state of the tide.
The shallow readings continued for 3/8 of a mile, then went back to
what they should be and remained o.k. all day until I rerturned and in
the same stretch of my creek (Moore's Creek off the Piakatank Rover) I
got extremely shallow readings in the same stretch. It read accurately
when I got back in my slip.
Anyone have any suggestions? At first I thought it was a glitch in the
instrument, but now I doubt that.
- Gordon White
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