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What u found initially ig gyro error ....to find magnetic compass error you have to use magnetic bearing to TRUE brg to get compass error....and applying variation on that gives deviation of compass .

Note that gyro compass is not affected by the variation.. therefore do not calculate gyro error and variation to get deviation.

great info. thank you for sharing However as I recall we use compass error to calculate deviation. not gyro error

Ayos tlaga.Very informative and helpful pra sa baguhan ug sa mga tang an.hehe

Salamat sa pag share sir.Ingun anaon d.i na.More uploads pa sir.How about NBDP sir?