STBYRUD - you said
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On most of our planes the DME-DME updating is off by default
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Why is that?? I don't have a lot of experience of state-of-the-art navigation, but on the only type I have flown with FMS updated by GPS, DME/DME, and l@ser inertial, the manual definitely said that DME/DME is the most accurate - makes sense that it would be more accurate than GPS as it is basically the same method of determining position, but from fixed position beacons rather than ones flying round in space..........