Question

On a old map, a line was drawn having a magnetic bearing of 320°30', when the declination was 3°­30'W. Find the present magnetic bearing of line, if the declination is 4°15'E.

• A. 321°15'
• B. 317°0'
• C. 319°45'
• D. 312°45'

Answer 1

The correct option is D 312°45'

True bearing = Magnetic bearing - Declination (west)

= 320°30' - 3­°30' = 317°0'

The true bearing of a line is constant,

So the present true bearing of line is also 317°0'.

$\therefore$ Present magnetic bearing = True bearing - Declination (East)

= 317°0' - 4°15' = 312°45'