Your present compass heading is 310°. In this area, the magnetic variation is 1°W, and your compass shows a deviation of 4°W on that heading. What is the corresponding true course you are flying?
Compass deviation (D): The difference between compass heading (C) and magnetic heading (M).
Magnetic variation (V): The difference between magnetic heading (M) and true heading (T).
Wind correction angle (WCA): The angle used to adjust from true track (TT) to true heading (T) to compensate for wind.
Drift (DR): The difference between true heading (T) and true track (TT).
When converting a compass heading to the true track:
| Direction | C | D | M | V | T | DR | TT |
| → | +E | +E | +R | ||||
| → | -W | -W | -L |
Keep in mind the phrase: "West is Best, East is Least," meaning that west corresponds to a plus (+) sign and east to a minus (–) sign.
Given:
- Compass Heading: 310°C
- Deviation: 4°W
- Variation: 1°W
| Direction | C | D | M | V | T | DR | TT |
| → | 310° | -4°W | 306° | -1°W | 305° |
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