With the implementation of flying, it is useful to be able to specify a destination in 3D space; there are several areas in Heavenward located directly above/below one another.

The implementation of an altimeter that displays your altitude as a number (height in yalms from the lower bound of the zone) would help to specify locations. This would also have the additional minor benefit of being able to tell when you are flying straight.

Can this feature be implemented?