[C320-list] Boat Speed

Tue Apr 25 21:43:54 PDT 2006

For me, love making for 3 seconds is an eternity.

Besides, I am always at least 30 minutes ahead of the other boats
because I am out sailing and they are still at the dock.

Adam

-----Original Message-----
From: C320-List-bounces at catalina320.com
[mailto:C320-List-bounces at catalina320.com] On Behalf Of
Orlando.Duran at AveryDennison.com
Sent: Tuesday, April 25, 2006 5:17 PM
To: Catalina 320 List
Subject: Re: [C320-list] Boat Speed

If you're racing, 3 seconds is an infinity.... :)
--------------------------
Regards,
OD

Sent from my BlackBerry Wireless Handheld

----- Original Message -----
From: C320-List-bounces
Sent: 04/25/2006 05:51 PM
To: "'C320-List'" <C320-List at catalina320.com>
Subject: Re: [C320-list] Boat Speed

Why don't you just set up GPS so it updates ever 3 seconds, like I did?

Adam

-----Original Message-----
From: C320-List-bounces at catalina320.com
[mailto:C320-List-bounces at catalina320.com] On Behalf Of
Orlando.Duran at AveryDennison.com
Sent: Tuesday, April 25, 2006 2:38 PM
To: Catalina 320 List
Subject: Re: [C320-list] Boat Speed

SOG info is from one point to another, info is usually at least 20-30
seconds old....something you do to trim or adjust, won't register as a
boat speed improvement (if any) for that length of timen conversely,
with a know meter, since the info is thru-the-water, results are instant
so you have a much better sense of what's working and what's not right
away...

cuba libre 2
--------------------------
Regards,
OD

Sent from my BlackBerry Wireless Handheld

----- Original Message -----
From: C320-List-bounces
Sent: 04/25/2006 03:30 PM
To: C320-List at catalina320.com
Subject: Re: [C320-list] Boat Speed

Please explain relation of knot meter to correct boat trim, I'm not
familiar with difference to GPS sog.

Thanks,

Len  

-----Original Message-----
From: Orlando.Duran at AveryDennison.com
To: Catalina 320 List <C320-List at catalina320.com>
Sent: Tue, 25 Apr 2006 15:16:03 -0700
Subject: Re: [C320-list] Boat Speed

Well, if you do any sort of racing--PHRF or Cruising--you cannot ignore
knot 
meter, that's the only way of knowing if any trim/adjustment is working.
A knot 
meter, correctly calibrated, is just as accurate but used for a
different 
reason. Igonoring a knot meter completely will never allow you to have
your boat 
in correct trim...

cuba libre 2
--------------------------
Regards,
OD

Sent from my BlackBerry Wireless Handheld

----- Original Message -----
From: C320-List-bounces
Sent: 04/25/2006 03:09 PM
To: C320-List at catalina320.com
Subject: Re: [C320-list] Boat Speed

I totally ignore the speed instrument, and rely on GPS sog  (speed over
ground) 
readout on chartplotter at the helm which I understand IS accurate
(unless 
satellite changes orbit or you're suddenly over the Marianas Trench).
Wonder 
how many 320's have GPS at this time?

Len
Aqua 5 #1070

-----Original Message-----
From: Walter burnett <selkie2003 at yahoo.com>
To: C320-List at catalina320.com
Sent: Tue, 25 Apr 2006 14:56:23 -0700 (PDT)
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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