Question 1772Navigation General70% to pass
The line of position should be plotted as a circle around the GP of the body when the Ho exceeds what minimum value?
AI Explanation
The correct answer is D) 87°.
When the Hc (calculated altitude) exceeds the Ho (observed altitude) by 87° or more, the line of position should be plotted as a circle around the geographic position of the celestial body. This is because when the difference between the calculated and observed altitudes is greater than 87°, the position line becomes ambiguous and cannot be reliably plotted as a straight line. Plotting it as a circle around the GP provides a more accurate representation of the potential position of the observer.
The other answer choices of 80°, 83°, and 85° are incorrect because they do not meet the 87° minimum threshold for plotting the line of position as a circle.
Related Questions
#1770 A position on the Earth has a longitude of 74°10'E. Its celestial counterpart would have a _______________.#1771 When plotting a circle of equal altitude for a high altitude sight, the radius of the circle is determined by the formula _______________.#1773 The GP of a body for a high altitude sight is determined from the declination and the . #1774 The GP of a body for a high altitude sight is determined from the declination and the _______________.#1775 What is the major problem with taking high altitude sun observations?