[C320-list] Knotmeter knot working

[Crosby Roper]

Allan,
 
Your GPS gives you speed over ground which may differ significantly from your speed through the water which your knot meter provides, especially when sailing in strong currents. I think you should still get accurate true and apparent wind readings which are calculated based on wind direction, wind speed, boat heading, and boat speed over ground, not speed through the water.
 
Crosby Roper
tethys # 1054 



> From: Allan.Field at comcast.net> To: c320-list at catalina320.com> Date: Wed, 28 Nov 2007 20:51:41 -0500> Subject: Re: [C320-list] Knotmeter knot working> > Bill - Sea Shadow's hull knotmeter has never seen water. We have the> complete Raymarine SeaTalk instrument system including color chart plotter> so this gives us boat speed. I believe that the only thing missing by not> having the knotmeter in is being able to read true wind but apparent wind> works for our needs as we don't race. Where we are on the Chesapeake Bay,> the knotmeter on my old boat had to be cleaned every week. Once I got GPS,> I never used the old knotmeter again either.> > Allan S. Field> Sea Shadow - #808> Columbia, MD> > -----Original Message-----> From: c320-list-bounces at catalina320.com> [mailto:c320-list-bounces at catalina320.com] On Behalf Of Bill Sloane> Sent: Tuesday, November 27, 2007 10:53 PM> To: c320-list at catalina320.org> Subject: [C320-list] Knotmeter knot working> > Forum:> > Having never owned a boat with a through hull knotmeter, I am not clear how> to fix one. It was not working this past Sunday when I went out for a> chilly but beautiful sail. A colleague at work told me that I need to> unscrew the fitting in the V-berth sump, and immediately screw in the spare> fitting that is tethered there. Is this in fact how you do> it? Isn't that opening a hole in the hull below the water line?> > I am pretty sure a crustacean or other volunteer has made a home up in the> little fly wheel that needs to be dislodged. Can I do this by entering> through the sump?> > Appreciate any advice.> > Bill> C-320 'Endless Summer', No. 554> Olympia Washington> > 
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