Attribute: Value of annual change in magnetic

Acronym: VALACM

Code: 173

Attribute type: F

Definition:

The annual change in magnetic variation values.

References:

INT 1: IB 68.1, 71;

S-4: 272.1;

Indication:

Unit: minute ('), negative west

Resolution: 0.1'

Format:

sxx.x s: sign, negative values only

Example:

-7.1 for an annual change of 7.1 minutes in the westerly direction.

Remarks:

A positive value, i.e. unsigned, indicates a change in an easterly direction and a negative value indicates a change in a westerly direction.

Distinction: value of magnetic variation;