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Old 19th Oct 2009, 07:02
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lion-g
 
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Great Circle Track - FMC/FMGS

Hi Guys,

Here's something that has been bothering me for the past week. As we all know, our FMC/FMGS calculates the IMT and dist from point A to point B based on great circle track.

My question is, if we go direct from point A to point C, bypassing point B, as compared to point A to Point C with abeam point of point B inserted into the FMC, will the distance travelled by the a/c be different?

My logic being the FMC will calculate the great circle track from point A to ABEAM point B then another great circle track from ABEAM point B to point C. Will the recalculation differs from a direct great circle track from point A to C ?

My guess is there will be difference in distance travelled in both cases.
Any comments ?

Hope the above explaination is clear enough

Thanks for your help,
Cheers,
lion-g
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