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5-5 Navigation

Nav Source

State

Description

GPS

GPS is the active state, and all external

deviation data being transmitted by the IFD is

in reference to the active GPS leg. Note that

if no GPS leg is active or if no GPS lock, the

nav mode will be displayed in yellow.

GPS  VLOC

GPS is the active state, and VLOC is armed.

If the GPS flight plan contains a VHF-based

procedure or leg (e.g. localizer final), then the

nav mode will automatically transition from

GPS to VLOC when the capture criteria have

been met. While GPS is active, all external

deviation data being transmitted by the IFD is

in reference to the active GPS leg. That

transitions to VHF deviation data when the

switch to VLOC is made.

VLOC

VLOC is the active state, and all external

deviation data being transmitted by the IFD is

in reference to the active VHF-based leg (e.g.

Inbound VOR course, localizer deviation,

etc). Note that if no VHF data is being

received (e.g. out of range, improperly tuned

nav radio, etc), the nav mode will be

displayed in yellow.

OBS

OBS becomes the active state and deviation

data being transmitted by the IFD is reactive

to the external course setting knob (or the

Nav Source knob if no external course control

is present) for the inbound/outbound course.

Note that this state is accessed by pushing in

the Nav Source knob, and then it takes the

place of pure GPS mode as described earlier

in this table.

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Avidyne IFD540 Installationshandbuch Seite 163