Question 1675Navigation General

The correct answer is B) 4°01.9'. To calculate the observed altitude (Ho), we need to apply the following formula: Ho = hs + (refraction correction) + (dip correction). The refraction correction is based on the temperature and barometric pressure, and the dip correction is based on the height of eye. Using the provided values, the refraction correction is approximately 0.3' and the dip correction is approximately 4.3'. Applying these corrections to the sextant altitude (hs) of 4°06.9' results in an observed altitude (Ho) of 4°01.9', which is the correct answer. The other options are incorrect because they do not accurately account for the refraction and dip corrections given the provided environmental conditions and height of eye.