Hi! Plz see attached pic: The GS seems to be way off, plz have a look at the blue example: GS should read 91, but actually shows 114 kts! Thx, Björn

Our groundspeed calculations are not incorrect. It is probably because you have a prolonged climb or descent as part of these legs which is affecting the time they are taking. Check your climb and descend profiles to make sure the IAS specified for climbs and descends makes sense for your aircraft.