SW allows me to seemingly attach a Reference Geometry Coordinate System to a flexible or floating body.

However when the body moves, the coordinate system graphic stays fixed in global space.  I don't see how this helps me measure vectors relative to the moving body.

Have I overlooked something?

I previously tried to measure vectors relative to edges (along) and faces (normal to) on the moving body, but the measurement property manager would accept only whole solids, not features, as a reference.  Solids don't have an implicit direction.

How have you done it?