Attribute: Value of magnetic variation
Attribute type: F
The magnetic variation value.
INT 1: IB 68.1, 71;
Unit: degree (°), negative west.
Resolution: 0.01 degree
Conversion factor: one tenth of a second = 0.000028 degree.
sxx.xx s: sign, negative values only.
2.3 for a magnetic north oriented at 2.3 degrees east from the geographic (true) north.
A positive value, i.e. unsigned, indicates variation in an easterly direction and a negative value indicates variation in a westerly direction.
Distinction: value of annual change in magnetic variation;