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Example :
Line AB was drawn with a magnetic bearing of 136° 45′ while the magnetic declination was 2° 30′ east In an old map. If magnetic declination is 3° 30′ west to what magnetic bearing the line should be set now?
Solution: Referring to given figure, it is clear that
Present magnetic bearing of line AB
= 3° 30′ + 2° 30′ + 136° 45′
= 142° 45′ Ans.
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