Exercise
Westmark to Alder Bay via CHARLIE, light wind, flat coastal terrain.
- Measure true track against the local Lambert meridian at each leg midpoint.
- Convert true track to magnetic track with a small westerly variation.
True → Magnetic → Compass · leg 1
True track (from local meridian)100°
±Wind correction angle2° L
=True heading097°
−Variation East (+) · interpolated+0.3°
=Magnetic heading097°
−Deviation+0.0°
=Compass heading097°
Magnetic = True − signed variation. 100° − (+0.3°) = 099° magnetic track.
Mnemonic check only: “East is least, West is best” — the arithmetic above is the reason.
Route
1 39° 07.2′ N 019° 56.4′ E
38° 54.0′ N 021° 36.0′ E
3 39° 42.5′ N 022° 18.0′ E
Insert waypoint