SailNet Community - View Single Post - GPS and Compass show different headings
View Single Post
Old 08-10-2010
jerryrlitton's Avatar
jerryrlitton jerryrlitton is offline
Senior Member
Join Date: Oct 2002
Location: Phuket, Thailand
Posts: 1,467
Thanks: 4
Thanked 10 Times in 10 Posts
Rep Power: 13
jerryrlitton will become famous soon enough
Send a message via ICQ to jerryrlitton Send a message via MSN to jerryrlitton Send a message via Yahoo to jerryrlitton Send a message via Skype™ to jerryrlitton
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.

"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)

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook