Navigation General · Compass - Gyro
Gyro error is expressed as:
- ASo many degrees East or West, applied like compass error to convert per-gyro (pgc) to true✓ Correct
- BVariation and deviation
- CA percentage of speed
- DA magnetic dip angle
Explanation
Gyro error is given as degrees East or West and applied the same way as magnetic compass error: 'gyro least, error east; gyro best, error west.' It is commonly checked by comparing an observed azimuth of a celestial body or a range with the gyro reading.
Authority: Bowditch (Pub. 9); gyro error
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