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Old 02-22-2012
Capt Len Capt Len is online now
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The compass formation by GPS is calculated internally from information like positions over time.It tells you where you've been.and you assume it's pointing the way you're going. Accidental in irons, gybe, MOB or maneuvering in fog and rocks and dark with current will show the short comings of not having a ""trusted ""compass .Before GPS I'd set my course by wave action and guesstimate my way across the Beaufort because compass was useless in rough weather (too far north) Understanding dev ,var, dec and error can save your butt.
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