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;