Compass Error - Variation + Deviation
Convert compass course to true course using variation (chart) and deviation (deviation card) - the classical "True Virgins Make Dull Company" chain.
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Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Compass course | °C | |
| Deviation | °E or W | |
| Variation | °E or W |
Source: Bowditch Pub.9 Ch.6
In short
Convert compass course to true course using variation (chart) and deviation (deviation card) - the classical \