Citizen Eco-Drive BN4021-02E Instruction Manual page 42

Calibrating compass indication
Executing declination correction
40
1
Press button
Compass function starts.
It may take a moment to indicate compass direction.
Wait until movement of the hands stop.
2
Press and hold button
The compass hand points the 3 o' c lock position.
3
Press button
The compass hand points the direction of declination
(east or west) and the 2.5 m hand shows the degree of
declination by pointing a second tick mark.
.
for 3 seconds or more.
for 3 seconds or more.