SailNet Community - View Single Post - Magnetic Variation
View Single Post
Old 07-21-2007
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
Here is the deal. Since the magnetic north pole and the geographical one are not co located we face a situation called magnetic variation. There are lines drawn on a chart that have either easterly or westerly variation. Now the reading on your compass as you see it is your magnetic heading but you need in most cases to apply the variation. West you add and east you subtract to get your magnetic course. For example you want to steer a 090 course and your line takes you through a area of 21West variation you would steer a magnetic heading of 111 degrees. Remember east is least and west is best. Hope that helps.

"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