Example 3
An information to read out on the navigational map. To calculate correcting for magnetic variation for 2004
Variation 0°40' E (1990) increasing about 5' annualy

Solution:
2004  1990 = 14, 14 × 5' = 70' which we are adding to 0° 40' E; Magnetic variation after 14 years
d = 0° 40' E + 70' = 1° 50' E
