Marine Compass
Marine Compass
how to find the compass error ? ( using nautical almanac)? For {$keyword}

marine

“…The compass error of variation and deviation for heading can be determined by bearings on the sun.

As the sun rises and sets at about the same arc angle either side of due N, adding sunrise/sunset compass bearing and dividing by 2 will give 180º (true S).

Any angle different from 180º will be the compass error: if < 180º, compass error is East; if > 180º, compass error is West.”

So basically you take the bearings at sunrise and sunset, sum them and divide by 2. Call this S. Now do

error (e) = S – 180º – this is the error.

Also, if S < 180º, i.e. if e < 0º, then the error is E;
if S > 180º, i.e. if e > 0º, then the error is W.

Example:

bearing sunrise = 075º
bearing sunset = 279º
sum= 354º
divide by 2 = 177º = S.
Compass error = 177 – 180 = -3 so 3º E.

Hope this makes sense, it’s not really my subject but I found this online.

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