PBN Navigation Aid Infrastructure
Even though ground-based radio beacons are not used for navigation in PBN operations, they do form part of the navigation database. Ground-based and/or space-based navigation aids are a key part of the PBN specification;
For ground-based: it includes VOR and DME (not NDB); and
For space-based: it includes GNSS satellites.
DME/DME/IRU is also used and it refers to navigation using DME ranging from at least two DME facilities to determine position along with use of an integrated Inertial Reference Unit (IRU).
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