Question 1537Navigation General70% to pass
The line of position determined from a sight with an observed altitude (Ho) of 88°45.0' should be _______________.
AI Explanation
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.
Related Questions
#1535 What celestial body may sometimes be observed in daylight? #1536 What is the relative bearing of an object broad on the starboard beam? #1538 You are ascending a river and exchanging navigational information via radiotelephone with a descending vessel. If the descending vessel advises you to "watch for the set" above point X, what would you expect to encounter above point X? #1539 The daily path of a celestial body that is parallel to the celestial equator is the _______________.#1540 In the celestial equator system of coordinates what is the equivalent to the meridians of the Earth system of coordinates?