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Does an enroute and approach IFR certified GPS, like a Garmin 430,
eliminate the requirement for marker beacon equipment in the
-- Richard Kruse, April 21, 2007
AOPA has a page about this on their Web site. You can't do an approach that is titled only "NDB 5" or whatever. Otherwise, the GPS may be substituted for an ADF.
-- Philip Greenspun, April 21, 2007
It also can't substitute for NDBs used in non-NDB approaches at alternate airport (e.g. KBED ILS 29 missed approach hold is at a marker beacon). If all approaches at an airport use NDB this way, it cannot be filed as alternate. Apparently it may be all right if the GPS is WAAS capable.
(I am preparing for instrument checkride and this came up in my in-school test. Could Philip please shed more light on this?)
-- S Lele, April 24, 2007