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# Great Circle Navigation IR / ATPL questions

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# Great Circle Navigation IR / ATPL questions

18th Jan 2010, 13:02

Join Date: Sep 2009
Location: central europe
Age: 31
Posts: 13
Great Circle Navigation IR / ATPL questions

hi to you all,

I have passed all subjects to my theoretical IR except flight performance and planning, wich will be tested next week. Im struggling with the great circle nav / and or plotting on respective charts and im doing hard in finding explaination.

When you plot positions on a polar stereographic chart, how do you measure an initial great circle course, an initial true course, - or derive an average true course?

Is it sufficient to set the course triangle to the initial point along a line between points and read the true course at the grid line of longitude? Will it involve the haversine formula or chart convergency / departure formula for questions with reference to charts?

Example Questions ;
Refer to Jeppesen Manual Chart 5 AT (HI)
The initital true true course from A (65°N 006°E) C (62°N 020°W ) is ?
Use route manual chart NAP
The average true course from A (64°N 006°E) to C (62°N 020°W) is:

Flight is cleared to Toronto via Atlantic track Echo from 55°N 010°W to maintain FL320 Mach .82. The forecast wind velocity and OAT at FL320 are 020°/110 kt and - 60°. The mean Great Circle track from (N57° W020°) to (N 57° W030°) is ?

Thank you in advance for your help..
yours manuel

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