Course Deviation Indicator; Changing Cdi Sources - Garmin G500 Pilot's Manual

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2.7

Course Deviation Indicator

The Course Deviation Indicator (CDI) moves left or right from the course
pointer along a lateral deviation scale to display aircraft position relative to the
course. If the course deviation data is not valid, the CDI is not displayed.
Navigation
Source
Crosstrack
Error
NOTE: The ILS Localizer and Glideslope deviation indicators will indicate
full-scale deflection for the GNS 480 navigator at the second dot. The
GNS 400W/500W series navigators will indicate full-scale deflection at
the edge of the display.
2.7.1

Changing CDI Sources

The CDI can display two sources of navigation: GPS or NAV (VOR, and LOC).
Color indicates the current navigation source: magenta (for GPS) or green (for
VOR and LOC). The full-scale limits for the CDI are defined by a GPS-derived
distance when coupled to GPS. When coupled to a VOR or localizer (LOC), the
CDI has the same angular limits as a mechanical CDI. If the CDI exceeds the
maximum deviation on the scale (two dots) while coupled to GPS, the crosstrack
error (XTK) is displayed below the white aircraft symbol.
2-22
360º HSI
Figure 2-30 Course Deviation Indicator
Garmin G500/G600 Pilot's Guide
GPS Level
of Service
Scale
CDI
190-00601-02 Rev. J