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Old 02-11-2007
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Larus Marinus
 
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More than that! There is an RTCA standard for LORAN-C receivers and they got so popular with GA pilots that the USCG was persuaded to put LORAN coverage across the continent. It was very popular, but then came GPS, which got even more popular. Since GA was not actually required to have radio instruments (Mk I eyeball and a road map does fine) except in controlled airspace, were a VOR receiver is required, the GPS was a gift.

But civil transport aircraft never adopted LORAN. Their required aircraft fit is one ADF, for NDB reception, two VOR receivers for redundancy and one (usually scanning) DME receiver. When Boeing and Airbus started adding GPS and standard (FANS 1 and FANS A fits) - which means the FMS gets to use the GPS data - the thought of wanting yet another receiver was not welcomed, much to the disgruntlement of the LORAN lobby. So arguing LORAN is needed as a back-up to GPS, completely ignores the fact that DME is backing-up GPS, VOR is backing up DME and behind it ADF, not to mention a couple of pilots trained to navigate with compass,airspeed, dead reckoning and charts
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