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post #18 of Old 04-02-2012
Brent Swain
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Re: Celestial Navigation: Nautical Almanac

For sun sights , almanacs repeat themselves every 4 years. So get 4 years in a row and you have all the backup you need for sun sights. Even one several years out of date is only about three miles out on sun sights.
I can tell people how to take a noon sight in about 5 minutes.

Brent Swain, Boat designer, Builder, and author of "Origami Metal Boatbuilding"
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