Yea but even with that we need to account for tides...the charts show depths at low tide, so I like my depth sounder to indicate actual depth from the water surface, and I usually use a positive offset of 2 feet which is as close as I measured with maybe a couple inches of comfort factor between the transducer and the water line when on the hard...no harm in your way and more comfort factor... it's only luck if the sounder gives the same depth as the charts because the charts show minimum depth over the contour region, there could be deeper spots within the contour area, that's good for us
Dwight Veinot C&C 35 MKII, *Alianna* Head of St. Margaret's Bay, NS d.ve...@bellaliant.net On Mon, Dec 21, 2015 at 10:02 PM, robert via CnC-List <cnc-list@cnc-list.com > wrote: > Dwight: > > I think your measurement of the offset from the waterline would be more > accurate to the chart.....I use the offset from the transducer to the > bottom of the keel to give me a slight 'comfort level' or 'insurance' as > happened this past Summer.....I wasn't on the helm when the alarm went > off....I'd much rather have anything more than 6" below the keel, which we > did. > > So I have my depth sounder set from the transducer rather than the > waterline.....I like the little extra safety (water) under me! I really > don't need to be exact, just close on the more water side. > > Rob Abbott > AZURA > C&C 32 -84 > Halifax, N.S. > > > On 2015-12-21 1:55 PM, dwight veinot via CnC-List wrote: > > Dennis maybe I don't understand what you're saying, but If you want the > depth shown to closely match the depth shown on the charts should the off > set not be from the transducer up to the waterline instead of down to the > bottom of the keel > > Dwight Veinot > C&C 35 MKII, *Alianna* > Head of St. Margaret's Bay, NS > d.ve...@bellaliant.net > > > On Sun, Dec 20, 2015 at 4:03 PM, Dennis C. via CnC-List < > cnc-list@cnc-list.com> 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 >> >> _______________________________________________ >> >> Email address: >> CnC-List@cnc-list.com >> To change your list preferences, including unsubscribing -- go to the >> bottom of page at: >> http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com >> >> >> > > > _______________________________________________ > > Email address:CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go to the bottom > of page at:http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > > > _______________________________________________ > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > >
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