kijangnim,
The point I am taking about is the NEXT WAYPOINT, displayed on the ND versus the active leg.
For the JET case, as long as you are not yet within the jet stream it makes sense, the FMS is blending the wind using an actual wind much weaker therefore the wind average is far less that what it should be, and it affects your predictions, until you are within the jetstream then ...
I thought you said the difference is because of
and That wind is used to compute the waypoint displayed on the ND, but will use the distance based on the bearing between the aircraft position and the waypoint, whereas on the MCDU it is based on the active leg (which could be great circle, rhumb line, Arc ....)
So which is which now?!