[Sabres magnetic schedule]

The variation in Virgin Islands is about 13 degrees, around the Chesapeake it's in the 7 to 10 range, and it would If you are sailing from Red Hook to Annapolis and you were going to set your compass for variation so that it read true you'd probably need to do it at least every 2 days to be w/i a degree or so and all that tweaking begs to have two people adjust it on the same day and have you end up on Diamond Shoals instead of Norfolk.

 

Unlike map reading when hiking you typically don't have the compass sitting on the chart with the lines aligned with the grid lines like you do on maps.

 

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[Magnetic Declination and handheld compasses]

Why is this not encorporated into sailboat binnacle compasses, or the handheld type? As I understand it , the binnacle type are adjustable for deviation, why not declination?

The only problem I see could be in the fact that a sailboat deck is rarely "parallel to the ground/sea, so could there be a physical construction problem?

 

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