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For NAT tracks it is DCT waypoint to waypoint - sort of join the dots! The tracks change every day and the number of possible routes are too numerous.
One feature of the FMC (Honeywell in my case) is that the waypoints do have short codes. rather than type in N5400.0W03000.0 you type 5430N and FMC knows where you mean.
The North Canadian tracks do stay the same, so NCAB in the route page will give you the correct waypoint for track B.
Clever stuff.....
T'bug
