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wind speed and direction in cruise

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on the display it is possible to see the wind direction/speed.

I know that it is a complicated an indirect calculation base on the informations derived by the meausing of the dynamic/static pressure/heading compared with the GPS measurements (to calculate groundspeed). The vectors analysys allows to know the wind direction/speed.

Now the question:

- What I see in the display is sometimes different (small difference) with the wind  direction/speed   readable on the FMC cruise page.

Why? Is it  a PMDG behaviour or does it happens also in in the real NGX? it due to a different source for the calculations?

Thank you.


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I don't have the technical reason but yes, this is common across all the Boeings.  My guess is that the wind vector on the ND is a dampened value not prone to rapid movements about where as the FMS provides a more "instant" measurement or at least it does on PROG pg 2.

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