wrote in message
...
I wonder what would the best way to calibrate a depth sounder.
From what I read most depth sounders default setting are calibrated from
the transducer to the sea bed.
Other prefer to adjust the setting to the water line to the bottom of the
sea or from the bottom of the keel.
I wonder what is the preferred method of calibrating?

I have mine set at the bottom trailing edge of my outboard rudder, being
that is lowest point. That is the zero point and I have the alarm set for
three feet. I want to know the ground clearance rather than how deep the
water is at this point. This carries over from my flying days.
Leanne