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From: Gil Johnson (no email)
Date: Mon Dec 03 2007 - 07:53:33 EST
It must have been a senior moment, as I was thinking about a discussion about radar and overlay mode, not the obvious topic about Autopilots.
Gil
----- Original Message ----
From: Peter Bennett <>
To: Gil Johnson <>;
Sent: Sunday, December 2, 2007 9:56:40 PM
Subject: Re: T&T: NAV Mode and Autopilots
Thursday, November 29, 2007, 6:54:20 PM, Gil wrote:
GJ> Mark Said: Since I use my autopilot on Auto, this problem doesn't affect my boat's heading.
GJ> Reply: Mark, your system may use compass heading data for its
GJ> AUTO Mode--not all do. Some use CoG for
GJ> their AUTO Mode and will be affected by GPS data errors.
GJ> Gil
I think it is highly unlikely that any autopilot would use COG from
the GPS as a heading reference in Auto mode - I would expect Auto mode
to be the "original" stand-alone autopilot mode which would use the
compass sensor as the reference.
The GPS CoG is, as it says, the Course over Ground - the direction the
vessel has travelled in the past several seconds - this may be only
loosely related to the direction the vessel is currently pointed,
which is what the autopilot needs to know to steer the boat.
-- Peter Bennett, VE7CEI Vancouver, B.C., Canada Ennos 31 "Honeycomb" GPS and NMEA info: http://vancouver-webpages.com/peter Vancouver Power Squadron: http://vancouver.powersquadron.ca ____________________________________________________________________________________ Be a better sports nut! Let your teams follow you with Yahoo Mobile. Try it now. http://mobile.yahoo.com/sports;_ylt=At9_qDKvtAbMuh1G1SQtBI7ntAcJ _______________________________________________ http://lists.samurai.com/mailman/listinfo/trawlers-and-trawlering To unsubscribe or modify your subscription options (get password, change email address, etc) go to: http://lists.samurai.com/mailman/options/trawlers-and-trawlering Trawlers & Trawlering and T&T are trademarks of Water World Productions. Unauthorized use is prohibited.
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