Drift and transport wander

[rudderrudderrat]

Hi Lars,

If you look at a globe of the Earth and if you have 3 gyros set with their axis at right angles to each other (X,Y,Z) and spin them to speed at some moment on on the equator, then if X is aligned towards the North Pole Star, Y is pointing East and Z is aligned vertically to earth, then you have your described your "Local" axis.

6 hours later, when the Earth has rotated through 90 degs, relative to an observer on Earth, your original original North axis (X) is still pointing North, your original East axis (Y) is now pointing vertically and your original vertical axis (Z) is now pointing West.

I could try a similar one at the North Pole and at mid Latitudes on the Earth - but my brain hurts.