SailNet Community - View Single Post - GPS and Compass show different headings
View Single Post
post #3 of Old 08-10-2010
jerryrlitton
Senior Member
 
jerryrlitton's Avatar
 
Join Date: Oct 2002
Location: Phuket, Thailand
Posts: 1,666
Thanks: 7
Thanked 18 Times in 18 Posts
Rep Power: 13
 
Quote:
Originally Posted by montenido View Post
Hi all,

I know this is a beginner question, but here goes. On my new (to me) boat, the compass and GPS show fairly different headings. I have a Raymarine C-60 and a Richie compass. I would assume that the GPS is the correct heading and that the compass needs calibration, but how do I know for sure?

Thanks, Bill
Ok 1st thing, your GPS is not showing a heading. It is showing a traffic across the ground usually in magnetic but that will depend on how you have yours configured. Of course your track will vary with current, winds and your leeway. Also your compass needs to be calibrated for your installation area (deviation) and it is also subject to magnetic variation. So it is no small wonder there is a difference between the 2.

Jerry

"Let there be light!" said God, and there was light! "Let there be blood!" says man, and there's a sea!
Lord Byron, Don Juan


S/V Temptation
Islander 44
Very non-production
(Well, 10 were made so sort of non production)






To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
jerryrlitton is offline  
Quote Share with Facebook
 
 
For the best viewing experience please update your browser to Google Chrome