Steven P. McNicoll wrote:




Actually, I did answer your question, twice. You're just too dim to realize
it.

You wrote, some time ago now; "The 'rule' is that direct routes initiated by
ATC are limited to the service volume of VOR (or rarely, NDBs) and the
controller can assure that
MIAs will not be violated." The "rule" has nothing to do with service
volumes. NAVAID usable distance limits in FAAO 7110.65 are based on MSL
altitudes and flight levels, service volumes are based on AGL altitudes.

Is the bulb any brighter now?


No, I need more help to understand how VOR or NDB direct-route
assignments by ATC are based on AGL altitudes.