User Guide

190-00494-00 Rev. B
Garmin G1000 Pilot’s Guide for the Cessna Citation Mustang
2-17
FLIGHT INSTRUMENTS
The annunciations listed in Table 2-2 can appear on the HSI when abnormal GPS conditions occur; see
Figure 2-27 for example annunciations. Refer to the GPS Navigation Section for more information on Dead
Reckoning Mode.
Annunciation Location Description
LOI
Lower left of
aircraft symbol
Loss of Integrity Monitoring–GPS integrity is insufficient for the current
phase of flight
WARN
Lower left of
aircraft symbol
Warning–RAIM function detects excessive GPS position errors
INTEG OK
Lower left of
aircraft symbol
Integrity OK–GPS integrity has been restored to within normal limits
(annunciation displayed for 5 seconds)
DR
Upper right of
aircraft symbol
Dead Reckoning–System is using projected position rather than GPS position
to compute navigation data and sequence active flight plan waypoints
Table 2-2 Abnormal GPS Conditions Annunciated on HSI
Figure 2-27 Example HSI Annunciations
OBS MODE
NOTE: VNV is inhibited while automatic waypoint sequencing has been suspended.
Enabling Omni-bearing Selector (OBS) Mode (with the OBS Softkey) suspends the automatic sequencing
of waypoints in a GPS flight plan (GPS must be the selected navigation source), but retains the current
“active-to” waypoint as the navigation reference even after passing the waypoint. ‘OBS’ is annunciated to
the lower right of the aircraft symbol when OBS Mode is selected (see Figure 2-28).
While OBS Mode is enabled, a course line is drawn through the “active-to” waypoint on the moving map.
The CRS Knob can be used to set a desired course to/from the waypoint (with a CRS Knob); pressing
the CRS Knob re-centers the CDI and returns the course pointer to the waypoint bearing. When the
OBS Softkey is pressed again (disabling OBS Mode), the GPS flight plan returns to normal operation with
automatic sequencing of waypoints, following the course set in OBS Mode. The flight path on the moving
map retains the modified course line.