Yep you got it right Randleman, I put a thru hull 20dg on mine and it always reads. I can measure it off keel to the stbd side and from the stern if you want me too.
I posted pics if you search under my name when I changed out my motor and took pics of the job.
ps I have a Furuno also.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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