BRNAVBasic Area Navigation Standards
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Introducing BRNAV has already allowed new routes to be introduced in en-route airspace; routes that are not constrained by the location of ground beacons.
PRNAV systems have higher navigation accuracy than BRNAV ones -- 1nm (1.85km) compared to 5nm (9.26km).
BRNAV is currently mandated in ECAC airspace and requires aircraft to be able to keep within 5nm of their intended position.