Garmin G900X Pilot's Manual page 384

HAZARD AVOIDANCE
4) Turn the large FMS Knob to select 'Register With GFDS' in the menu list.
5) Press the ENT Key. The Garmin Flight Data Service Registration window is displayed as shown in Figure 6-55.
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Figure 6-54 Select Register With GFDS
Figure 6-55 Enter Access Code
Garmin G900X Pilot's Guide
190-00726-00 Rev. J