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Great Circle Navigation IR / ATPL questions

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Great Circle Navigation IR / ATPL questions

Old 18th Jan 2010, 13:02
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Thread Starter
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 (65N 006E) C (62N 020W ) is ?
Use route manual chart NAP
The average true course from A (64N 006E) to C (62N 020W) is:

Flight is cleared to Toronto via Atlantic track Echo from 55N 010W 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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