aquarium1, quietly now. It may help by specifying the aircraft type, nav fit, and or particular operation.
There are many methods of calculating a wind vector, and even for the same aircraft type in the choice of which one to display; IRS, GPS, smoothed inertial nav, integrated nav position, etc.
I will not be able to provide an answer re on the ground, as my aircraft did not display a vector until the airborne calculation was considered valid.
The answer to a question is often obvious once the problem behind the question is understood.