Seem to me ,
you guys donīt get it.
If the GPS would include the AOA the GPS would show higher readings.
And I told you to watch carefully. You didnīt.
If the speed is from the bungee then how is it possible that three different planes get approx three different speed with three different engines? If the bungee would give the speed then how is that possible? The speed after leaving the bungee is approx. 65mph.
If there is an position error the GPS still meassures the distance between two points correct with the same error. That means the distance between two points remains the same.
And you get correct readings. And by the way using an other(larger) GPS is not possible due to the size of it.

Vmax