IFD400 Series Pilot Guide
5-18 Navigation
AUTO VLOC TUNING †
Auto-VLOC tuning is a user option which enables the automatic
tuning of the active nav frequency slot to follow the governing
navaid in the flight plan.
If the active leg is part of a VHF approach, the FMS will auto-tune
the navaid that defines the final approach.
If the active leg is not part of a VHF approach, and if the active
leg has a recommended navaid in the nav database, the FMS will
auto-tune that navaid. Otherwise, from the active leg, the FMS
will look backward through the route and forward through the
route for legs with a recommended navaid or that are defined by
a navaid, in which case, the FMS auto-tunes the one of those two
navaids that is closer to the aircraft.
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