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A ship is to reach a place 20^(@) south ...

A ship is to reach a place `20^(@)` south of west . In what direction should it be steered if angle of declination at the place is `16^(@)` west ?

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Ship has to reach `20 ^(@)` south of west along line OA. It should be steered west of north of magnetic north at an angle
`phi [90^(@) + (20^(@) - 16^(@))]`
`phi 94^(@)` west of north
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