ADF and GPS equip %
I'm not aware of any requirement that an aircraft owner report to
any government entity just what avionics are installed in his
plane. [...]
But perhaps it can be approximately inferred from an archive of IFR
flight plans. /G is obvious (subject to slight .. exaggeration .. by
vfr-gps folks); suspect ADF if filed destination/alternate are not
both served by other navaids.
- FChE
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