AVenugopal

A Compass works because of the magnetic Flux between the earths poles. What you see on a Compass then is Magnetic North not True North.

You must get a copy of the chart (see your local Library) that locates the current position of the Magnetic North Pole (Current because it moves) and the relative angle of deflection of the True North from your actual plant location to determine the relationship between True North, Magnetic North and Plant North.