Garmin G3X Touch Pilot's Manual page 246

Additional Features
5) Tell the G3X Touch or external navigator what to do with the transferred
flight plan:
If FPL Source > Internal is selected on the Flight Plan Page, a Flight
Plan Received notification is displayed on the G3X Touch. Touch one of
the following:
Ignore: Discard the flight plan.
Store: Save the flight plan to the Flight Plan List.
Activate: Activate the flight plan without saving it to the Flight Plan List.
Or:
If FPL Source > External is selected on the Flight Plan Page, the flight
plan is automatically pushed to the external navigator. A message flashes
on the external navigator to prompt the pilot to review and accept the
flight plan. The pilot can then choose to save or activate the transferred
flight plan on the external navigator.
Pairing the G3X Touch to a GDL39/39R:
NOTE: Bluetooth pairing is not necessary, and should not be performed, on
a display where the GDL39/39R is hardwired to the display.
1) Power on the GDL39/39R. The GDL39/39R will automatically enter
Bluetooth pairing mode.
2) Press the MENU Key twice.
3) Touch Setup > Bluetooth.
4) If Bluetooth is set to Off, touch the Bluetooth
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Flight Plan Received Notification
Garmin G3X Touch Pilot's Guide
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190-01754-00 Rev. E