MCA Master Yacht Celestial Navigation Practice Questions - MCA Master Yacht - Celestial Navigation (IAMI Written Examination) Exam

In celestial navigation, what does ‘index error’ of a marine sextant describe?

The residual reading when the true and reflected horizons coincide but the instrument does not read exactly zero The difference between observed and calculated altitude (the intercept) The correction for the observer’s height of eye The error caused only by abnormal atmospheric refraction

Correct Answer:

The residual reading when the true and reflected horizons coincide but the instrument does not read exactly zero

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