BoatBanter.com - View Single Post - Which echo sounder is good up to (almost) zero depth?

Eisboch

"Short Wave Sportfishing" wrote in message
...
On Mon, 09 Jun 2008 11:04:13 -0400, wrote:

In a sailboat, the transducer would be mounted in the hull, above the
level of the top of the keel, so you would have 4-10 feet (depending
on how deep a keel you have) of water even with the keel scraping
bottom. Sounders usually have a "keel offset" setting to compensate
and tell you how much depth remains after the keel height is
subtracted.

I understand that - I'm not clear on the whole zero depth concept.

The Navigator had a Raytheon system on it that was calibrated for the
transducer location versus the actual hull depth.
It was accurate to 2.8 feet. Ask me why I know.

Eisboch