On Pegasus, I added a foot to the offset on the chart plotter, and read
actual depth on the autopilot display. Mainly because I couldn't figure how to
set the offset on the Raymarine ST70 display. But it actually works out great.
I know the depth for anchoring and still have water under me when the
chartplotter says zero when moving. No high tec math here. So far I haven't
found the bottom with my keel, just the anchor. Knock on wood!.
Doug MountjoysvPegasusLF38 just west of Ballard, WA.
------ Original message------From: Dennis C. via CnC-ListDate: Sun, Dec 20,
2015 12:04To: CnClist;Cc: Dennis C.;Subject:Stus-List Winter discussions -
depth sounder offset
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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