I use the same, depth sounder shows water depth to compare to charts.
If I recall correctly, in my Raymarine setup I adjusted for the depth
of the transducer below the waterline, and since I have clear hoses on
my cockpit drains I was able to get a decent estimate of transducer's depth.
Neil Gallagher
Weatherly 35-1
Glen Cove, NY
On 12/20/2015 3:03 PM, Dennis C. via CnC-List wrote:
Just curious what listers use for a draft offset and why.
I use the actual offset as measured from the transducer to the bottom
of the keel so the depth shown closely matches the charted depth. I
prefer to compare the depth shown on my instruments to the chart
plotter rather than have to do the math all the time.
I know some owners use an offset so that the instrument shows depth
under keel while others don't use any offset at all.
Dennis C.
Touche' 35-1 #83
Mandeville, LA
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