Attribute: Value of magnetic variation

Acronym: VALMAG

Code: 176

Attribute type: F

Definition:

The magnetic variation value.

References:

INT 1: IB 68.1, 71;

S-4: 272.1;

Indication:

Unit: degree (°), negative west.

Resolution: 0.01 degree

Conversion factor: one tenth of a second = 0.000028 degree.

Format:

sxx.xx s: sign, negative values only.

Example:

2.3 for a magnetic north oriented at 2.3 degrees east from the geographic (true) north.

Remarks:

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;