[C320-list] Boat Speed

[WindSwept]

John,

Ask Orlando about the thong thing.  That should be good for many Emails.
----- Original Message ----- 
From: "John Van Vessem" <jvanvessem at sbcglobal.net>
To: "C320-List" <C320-List at catalina320.com>
Sent: Thursday, April 27, 2006 8:56 PM
Subject: Re: [C320-list] Boat Speed


> Orlando, I'd like to meet you some day, you sound like a fun guy.
>
>  John (Sojourn 645)
>
> Orlando.Duran at AveryDennison.com wrote:
>  Mine is fine, I average about 7kn in all wind speeds and I like that...
>
> Also, how come my knot meter and GPS don't sync? :)
>
> cuba libre 2
> --------------------------
> Regards,
> OD
>
> Sent from my BlackBerry Wireless Handheld
>
>
>
> ----- Original Message -----
> From: C320-List-bounces
> Sent: 04/25/2006 02:56 PM
> To: C320-List at catalina320.com
> Subject: [C320-list] Boat Speed
>
> All,
>
> It occurs to me the many variations in reported boat speed is likely due 
> to variations in the speed sensor calibration, or lack thereof. The only 
> accurate way to calibrate the boat speed sensor is by timing multiple 
> passes ata a constant speed through a measured course in slack water and 
> opposite directions. Average the runs, calculate the speed and compare it 
> to the readout for a correction factor to enter into the display. The more 
> and longer the runs, the more accurate the calibration.
>
> In my experience the speedo out of the box can be off as much as 25%. I 
> suspect most boat dealers don't make any effort to calibrate the 
> instruments before delivery and many skippers either don't know or don't 
> bother.
>
> Walter
> Selkie #887
>
>
> ---------------------------------
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>
> John Van Vessem
> Sojourn 645
> Vallejo Yacht Club
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