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Roy Smith wrote:

J Haggerty wrote:
TACAN aircraft cannot hold directly over a
VORTAC or TACAN (unless they also have a VOR).

Why not?

He's right in the case of a TACAN, wrong in the case of a VORTAC.


Why? What difference does it make to a TACAN-only aircraft if the navaid is
a TACAN or a VORTAC?