A 150km (80 NM) RNAV distance-based separation minimum with Mach
number technique may be used on same-direction tracks in lieu of a 10-minute
longitudinal separation minimum with Mach number technique, provided:
(a) each aircraft reports its distance to or from the same “on-track” common
point;
(b) separation between aircraft at the same level is checked by obtaining
simultaneous RNAV distance readings from the aircraft at frequent intervals to
ensure that the minimum will not be infringed;
(c) separation between aircraft during climbing or descending is established by
obtaining simultaneous RNAV distance readings from the aircraft; and
(d) in the case of aircraft climbing or descending, one aircraft maintains a
level while vertical separation does not exist.