Question 818Navigation General70% to pass
A sextant having an index error that is "off the arc" has a _______________.
AI Explanation
The correct answer is B) positive correction.
When a sextant has an index error that is "off the arc", it means the index correction is positive. This is because the index error is in the direction that increases the altitude measured by the sextant. To correct the observation, a positive correction must be applied to the observed altitude to get the true altitude.
The other options are incorrect because:
A) Dip error is related to the horizon, not the index error.
C) Semidiameter error is a different type of error not related to the index error.
D) A negative correction would be applied if the index error was in the opposite direction, decreasing the observed altitude.
Related Questions
#816 A Doppler log in the volume reverberation mode indicates _______________.#817 Isobars on a weather map are useful in predicting _______________.#819 A easterly wave is located 200 miles due west of your position, which is north of the equator. Where will the wave be in 24 hours? #820 The marine sextant is subject to seven different types of errors, four of which may be corrected by the navigator. An error NOT correctable by the navigator is _______________.#821 Index error of a sextant is primarily caused by _______________.