Just ran across this (from Instrument Procedures Handbook, FAA-H-8261-1,
page 4-6):
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The International Civil Aviation Organization (ICAO) definition of
established is considered as being within half full scale deflection
for the ILS and VOR, or within +/- 5 degrees of the required bearing
for the nondirectional radio beacon (NDB).

Thanks. That's very intersting and helpful.

Jose
--
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