A sextant having an index error that is "off...

Question 1 of 2707066636ee928f7522a1c51a08c

A sextant having an index error that is "off the arc" has a __________.

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Question 1 of 27070

Q

A sextant having an index error that is "off the arc" has a __________.

🔍 Key Concepts

• Index error on a sextant and what "on the arc" vs. "off the arc" means • Relationship between index error and the sign of the correction you apply to an observed angle • Difference between index-related errors and other sextant errors like dip and semidiameter

💭 Think About

• When you bring the direct and reflected images of the horizon together with the index arm set slightly before zero, is that called "on the arc" or "off the arc"? • If the zero of the vernier must be moved onto the arc scale to remove the error, what does that say about the sign of the correction you apply to your sextant readings? • Which of the answer choices are types of correction versus other types of errors unrelated to index error?

✅ Before You Answer

• Be clear on whether index correction is added or subtracted when the error is "off the arc" versus "on the arc" • Confirm that dip and semidiameter are separate sight corrections not used to describe index error direction • Identify which options are specifically about the sign of the correction (positive/negative), since that is what "off the arc" is telling you about.