PLG12863E AFI4700 Pilot’s Guide 73
3.4 Heading Source Selection
A cockpit switch for each display selects the heading source. The pilot
or copilot can select their EFI to display heading from either the same
side or offside source. HDG1 or HDG2 is annunciated in the top left
corner of the HSI to indicate which side the heading is sourced from.
Even though one display may be listening to an offside source, HDG1
or HDG2 appears on both displays to alert both pilots that the
headings are not independent.
Figure 3-26: Onside Heading
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