[C320-list] Boat Speed

[John Van Vessem]

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