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 16°00'W for most of the bay and 16°15'W in the northern, almost inland parts. 15' is not relevant at those distances.
s/v Laelia - 1978 Pearson 365 ketch
s/v Essorant - 1972 Catalina 27
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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.
However go from NY to Ireland the Atlantic is in the way no? RTFT.
Originally Posted by AdamLein View Post
"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
(Well, 10 were made so sort of non production)
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