Navigation General · Compass Error
Compass error is the combined result of:
- AVariation alone
- BDeviation alone
- CVariation plus deviation✓ Correct
- DVariation minus gyro error
Explanation
Compass error = Variation + Deviation (algebraic sum, respecting sign). If both are same name, add; if opposite names, take the difference and use the name of the larger.
Authority: Bowditch (Pub. 9)
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