SailNet Community - View Single Post - a question about rhumb lines
View Single Post
post #12 of Old 05-04-2010
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
 
You're absolutely right. A rhumb line across Casco Bay will be a constant compass heading, but one from New York to Ireland will change slightly as yo go along. I once learned all about the details of why that is so from the USPS's Junior Navigation course, but I have to confess that it escapes me now. I just remember it was so.
Quote:
Originally Posted by AdamLein View Post
Casco Bay is not the Atlantic Ocean. As far as I can tell either from isogonic charts (which are just about the smallest scale charts out there) or from the roses on Chart 13290, the variation does not change significantly throughout the bay, being 1600'W for most of the bay and 1615'W in the northern, almost inland parts. 15' is not relevant at those distances.
However go from NY to Ireland the Atlantic is in the way no? RTFT.

"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