Oxford, Air Navigation
Departure: DGCA Air Navigation questions
Departure is distance east or west along a parallel of latitude. Meridians close together towards the poles, so in nautical miles departure is the change of longitude in minutes times the cosine of latitude.
Nearly all 20 questions are numericals on that formula: a distance along a parallel, the latitude for a given departure, or a final position after legs flown north, east, south and west. Some add ground speed, Mach number or kilometres. Candidates have met 1 of these in exam sessions.
Use cosine here, since sine belongs to convergency. A four sided route does not close, because its east and west legs sit on different parallels. One nautical mile is 1.852 km.
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Question 1 of 5
A flight is made along the parallel of latitude from A 48°00'N 04°00'W to B 48°00'N 02°27'E. What is the distance?
Question 2 of 5
An aircraft flies 1000 NM along a rhumb line track of (090°T) from C 36°00'N 174°45'E. What is the longitude of D?
Question 3 of 5
Starting from E (50°N), the following rhumb line legs are flown: E→F (000°T) 300 NM; F→G (090°T) 300 NM; G→H (180°T) 300 NM. What is the rhumb line bearing and distance of H from E?
Question 4 of 5
What is the track and distance measured along the parallel of latitude 80°S from 176°15'W to 179°45'E?
Question 5 of 5
At which latitude is a difference in longitude of 44°10' equivalent to a departure of 2295 NM?
15 more questions in this chapter
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