Question 815Navigation General70% to pass
A sextant having an index error that is "on the arc" has a _______________.
AI Explanation
The correct answer is C) negative correction.
When a sextant has an index error that is "on the arc", it means the index correction is negative. This is because the sextant is reading a higher angle than the true angle being measured. To correct for this, a negative correction must be applied to the sextant reading to obtain the true angle.
The other answer choices are incorrect because:
A) A positive correction would be used if the sextant was reading a lower angle than the true angle.
B) Dip error is a separate type of error caused by the observer's height above the horizon.
D) Semidiameter error is a different type of error caused by the size of the observed celestial body.
Related Questions
#813 For a well made and well maintained sextant, the maximum value of which correction is usually so small that it can be ignored? #814 Most GPS receivers use the Doppler shift of the carrier phase to compute _______________.#816 A Doppler log in the volume reverberation mode indicates _______________.#817 Isobars on a weather map are useful in predicting _______________.#818 A sextant having an index error that is "off the arc" has a _______________.