Hamilton KHAKI X-WIND Quartz Chronograph GMT Instruction Manual página 9

6. From the geographical bearing, calculate the magnetic bearing of the aircraft: The variation (Var) depends
on the current location, which can be determined from an aviation chart.
Ex. Geographical bearing: 30°
Variation (Var): 10°
Magnetic bearing: 30° + 10° = 40°
Tn: True North | Mn: Magnetic North | Var: Variation
If the variation (Var) is to the West, it is added to
the geographical bearing to obtain the magnetic
bearing. Ex. 30° + 10° = 40°
7. Calculation of crosswind angle.
Ex. Wind direction: 70°
Magnetic bearing of aircraft: 40°
Crosswind angle: 70° – 40° = 30° (headwind)
70° – 40° = 30°
(Headwind)
M044 - INSTRUCTION MANUAL
If the variation (Var) is to the east, it is subtracted from
the geographical bearing to obtain the magnetic bear-
ing. ex. 30° – 15° = 15°
180° – (330° - 220°) = 70°
(Tailwind)
360° – (330° - 40°) = 70°
(Headwind)
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