>
It is the horizontal angle between true meridian and magnetic meridian at a
place shown by the needle at the time of observation.
>
Eastern or positive declination: when magnetic meridian is to the right or
eastern of true meridian.
Declination east (+ve) Declination
west (-ve)
> Western or negative
decli8nation: when declination is to the left or western side oftrue meridian.
> Mariners call declination as
variation. Must be having adjustable coils to avoid dip.
> “Isogonics lines” are the
lines drawn through the points of same declination.
> “Agonic lines” are the line
made up ofjoining points having zero declination.
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