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The values are there to be used as IAS or ground speed; it is pilot
option.


How can that be an option? There can be significant differences between
them.



Jeppesen is making an assumption that is not a regulatory charting value.


If the values are the same on NACO and Jeppesen charts, and if Jeppesen uses
GS as you say, then it should be clear that NACO uses GS as well.

Whatever made you think they were IAS anyway?