DME versus VOR

Comments (5)

Manuel Márquez

Many thanks for your answers.
We may say that the PBN enacts the use of the GNSS in the continental enroute phase with the support of the DME/DME Wich provides accuracy and also integrity (you may compare) of the GNSS signal and the use of the GNSS+INS in the oceanic enroute phase, providing GNSS to INS accuracy and INS to GNSS integrity.

Robert Gottwald

The modern/contemporary FMCs use hydrid GPS inertial data and when GPS is not available revert to hybrid radio inertial data, usually including DME/DME, VOR/DME and ILS (LOC).
For example for the 737NG/MAX, the FMC position updates from navigation sensor positions are used in the following priority order: GPS, DME/DME, VOR/DME, LOC/DME and LOC.

Manuel Márquez

Many thanks Robert, and I understand the 737NG/MAX when taking the data coming from GPS, that data is generated really by the GPS+INS system, or as you mentioned before the hybrid GPS inertial data system.

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