PLG12863E AFI4700 Pilot’s Guide 44
3.2.3.2 CDI Sources
VOR1 or VOR2
When the active navigation source is VOR1 or VOR2 and the aircraft
is exactly aligned with the course radial, the deviation bar will be
centered. The bar tracks left or right to indicate position to the left or
right of the selected course.
Each of the four (4) white dots represents a 5° deviation from the
course line. A maximum of 12° of deviation can be depicted, indicated
by the portion of the course deviation bar furthest from the ownship
icon partially obscured.
The selected course indicator, course deviation bar, and course
pointer are colored green.
GPS1 or GPS2
If GPS1 or GPS2 is selected as the active navigation source, the
course deviation bar is commanded by the GPS’s lateral cross-track
error. Each dot no longer represents a constant deviation and
changes based on phase of flight and type of approach. Consult the
GPS operations manual for more information.
The selected course indicator, course deviation bar, and course
pointer are colored magenta.
3.2.3.3 Bearing Preview
Two (2) bearing pointers are available for display on the compass card
to orient the aircraft with a selected navigation target without changing
the active navigation source.
As with all navigation indicators, bearing pointers are corrected as
necessary to be consistent with the current compass card heading
source (Magnetic or True).
The Bearings (BRGS) tab in the system menu enables bearing
pointers. The left bezel button cycles through NAV 1 sources and
center bezel buttons cycle through NAV 2 sources.
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