Garmin G900X Pilot's Manual page 78

FLIGHT INSTRUMENTS
When set to 'Auto' (default), the GPS CDI scale automatically adjusts to the desired limits based upon the
current phase of flight (Figure 2-25, Table 2-1).
Departure
• Once a departure procedure is activated, the CDI is scaled for departure (0.3 nm).
• The system switches from departure to terminal CDI scaling (1.0 nm) under the following conditions:
- The next leg in the procedure is not aligned with the departure runway
- The next leg in the departure procedure is not CA, CD, CF, CI, CR, DF, FA, FC, FD, FM, IF, or TF (see
Glossary for leg type definitions)
- After any leg in the departure procedure that is not CA or FA
• At 30 nm from the departure airport (or at the last departure waypoint if more than 30 nm from the
departure airport), the enroute phase of flight is automatically entered and CDI scaling changes to 2.0 nm
over a distance of 1.0 nm.
• If after completing the departure procedure the nearest airport is more than 200 nm away from the aircraft
and the approach procedure has not yet commenced, the CDI is scaled for oceanic flight (2.0 nm).
• Within 31 nm of the destination airport (terminal area), the CDI scale gradually ramps down from 2.0 nm
to 1.0 nm over a distance of 1.0 nm; if a transition back to enroute flight occurs, the CDI scale increases
back to 2.0 in the same manner.
• During approach, the CDI scale ramps down even further (see Figures 2-26 and 2-27). This transition
normally occurs within 2.0 nm of the final approach fix (FAF). The CDI switches to approach scaling
automatically once the approach procedure is activated or if Vector-to-Final (VTF) is selected.
- If the active waypoint is the FAF, the ground track and the bearing to the FAF must be within 45° of the
final approach segment course.
- If the active waypoint is part of the missed approach procedure, the active leg and preceding missed
approach legs must be aligned with the final approach segment course and the aircraft must not have
passed the turn initiation point.
2-18
Enroute
Terminal
(Oceanic if >200 nm
from nearest airport)
Figure 2-25 Automatic CDI Scaling
Garmin G900X Pilot's Guide
Refer to accompanying
approach CDI scaling figures
Terminal Approach
Missed
Approach
190-00726-00 Rev. A