BY ORDER OF THE SECRETARY OF THE AIR FORCE AIR FORCE ...

154
AFMAN 11-217V1 3 JANUARY 2005
Figure 8.4. Canadian Northern Control Area Boundaries (Areas South of 70°N Where
True Tracks Apply).
8.4.7.4.1. Enroute navigation using approved RNAV equipment backed up by
display of VOR/TAC/NDB data is recommended.
8.4.7.4.1.1. Depending on system architecture, aircraft navigation computers
(flight management systems) automatically provide magnetic variation
information. Accuracy of this magnetic variation depends on the period of
time since the last magnetic variation update. Some systems contain magnetic
variation information that cannot be updated. Also, some navigation systems
provide magnetic variation information for only a limited portion of the globe.
Thus, when true or grid heading information cannot be displayed, aircraft
magnetic variation information must be verified with current aeronautical
charts prior to use of RNAV equipment to fly true or grid courses. For
navigation using FMS or other RNAV system, procedures and system
limitations vary widely among aircraft and avionics installations. Consult
your aircraft flight manual and MAJCOM directives for specific FMS and
RNAV procedures for navigation where reference to true or grid north is
required.
8.4.7.5. For navigation using VOR or TACAN, if the NAVAID is oriented to true
north, use the following procedures for enroute navigation: