Hello Lee,

I had posted a response to your question earlier, but for some reason
it didn't take.
If your instrument is a S200DL then there is not a keel offset
adjustment on this model. All readings are from beneath the face of
the transducer. If you have another model depth sounder, please
contact me by email and I can let you know how to make the adjustment
(if it is possible).

Steve
Steve,

I thought that Datamarine was no longer in business. Perhaps you
could answer my question. I have a Datamarine depth sounder but
cannot figure out any way to adjust the reading to give me an accurate
depth since the transducer is a few feet below the waterline. I have
a manual for a slightly more modern Datamarine depth sounder on
another boat, but it also does not have any instructions on how to
compensate for the location of the sounder. Any help would be
appreciated.

Lee Huddleston
s/v Truelove