Question 1537Navigation General

The correct answer is B) plotted as an arc around the GP of the body. This is because when the observed altitude (Ho) is very close to 90 degrees (in this case, 88°45.0'), the resulting line of position is an arc centered on the geographic position (GP) of the celestial body. This is because at these high altitudes, small changes in the observed altitude result in large changes in azimuth, making it more appropriate to plot the line of position as an arc rather than a latitude or longitude line. The other options are incorrect because: A) is not appropriate for an altitude this close to 90 degrees, C) would only be correct for a sight taken on the meridian, and D) would be incorrect since the line of position is not a longitude line at this high altitude.