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 How deep is the bottom of the boat?		  New Topic  Topic Locked
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Ed Cassidy
Captain

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USA
365 Posts
Initially Posted - 02/24/2008 :  20:37:46  Show Profile
At first glance, that seems like a goofy question, but what I am trying to find out is what to set the depth sounder to. The specs say I draw 2' 8" with the keel up and 5' with the keel down. With the transducer mounted in the bottom of the hull, beside the keel box, what should I set the sounder to? I think that 2' would be about right but what is best practices? Does the sounder get set to indicate depth below the keel or depth below the surface or somewhere in between?
Thanks,
Ed

Ed
HisHorse
1979 SR/SK #1393
Green Cove Springs, FL
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 02/24/2008 :  21:50:14  Show Profile
Ed,

Since I know how much I draw, I like my depth sounder to read actual water depth.
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 02/24/2008 :  21:59:52  Show Profile
You're looking for the 'keel offset' right? That corrects the sounder to read 'true depth'... based on the water surface.

At any rate, 1.5' is what I use for the offset on my swing keel. (Determined by looking while having the admrial hold up a tape measure alongside the hull.) For practical purposes, I think either value would work ok. If you're down to worrying about a couple inches of depth you're probably already too shallow anyway.
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Dave5041
Former Mainsheet Editor

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USA
3758 Posts
Response Posted - 02/24/2008 :  22:04:42  Show Profile
I'm getting older, and I think displaying depth below the keel would just confuse me. I too like the actual depth. The surface offset you use isn't really critical, just be sure it is at least equal to the the depth of your transducer. You never know exactly how deep the water is; mounting angle, heel,waves, and instrument accuracy are all variables that you don't control and affect readings. If you think it is at least 2 feet, call it three and be safe.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.