Question 117Navigation Problems

The correct answer is D) 46°32.6'. The observed altitude (Ho) is calculated by adding the sextant altitude (hs) and the index error. In this case, the sextant altitude is 46°20.3' and the index error is 4.5' off the arc, which means the index error is added to the sextant altitude. Therefore, the observed altitude (Ho) is 46°20.3' + 4.5' = 46°24.8'. The other answer choices are incorrect because they do not correctly account for the index error. Option A) 46°24.2' does not include the index error, option B) 46°30.1' and option C) 46°27.9' include the index error incorrectly.