How to - GPS Navigation (INS + GPS)

[mattY]

To expand operational flexibility and support modern navigation techniques alongside the inertial navigation system (INS), the autopilot (AFCS) now includes a GPS mode. This mode integrates a conventional GPS unit while preserving the familiar AFCS philosophy of button cycling to engage/disengage flight modes (similar to pitch modes).

GPS mode is activated using the VOR button on the AFCS panel. The system automatically selects the navigation source based on the current state of the GPS CDI indicator.

(Click to enlarge image)

To engage GPS mode

1. Verify GPS CDI source Ensure the GPS unit displays "GPS" in the CDI area (not "VLOC" or another source). If necessary, press the CDI button on the GPS unit repeatedly until "GPS" appears.
2. Engage AFCS mode Press the VOR button on the AFCS panel. Confirm the VOR button light illuminates (indicating mode armed/engaged).
3. Confirm guidance Verify that the captain's HSI and Flight Director (FD) display the desired GPS-derived course, deviation, and steering commands.

Important notes

• GPS mode is available if the NAVIGATION OPTIONS on the EFB are set to GPS only or INS+GPS
• VOR Mode is not dynamic Once engaged, the AFCS locks onto the navigation source present at the moment the VOR button is pressed. If you later change the GPS CDI source (e.g., from "GPS" to "VLOC"), the autopilot will not automatically switch. To update the mode:
  • Press the VOR button again to disengage the current mode.
  • Re-press the VOR button to re-engage using the new source. This maintains the consistent AFCS philosophy of cycling buttons to change or refresh modes (as seen in pitch hold, vertical speed, etc.).
• Flight plan import You may import flight plans from the simulator's Flight Planner directly into the GPS unit. In the EFB (Electronic Flight Bag), select your route and press SEND TO AVIONICS.
• Display limitations All GPS-derived data (course, crosstrack deviation, TO/FROM indication, etc.) appear exclusively on the captain's HSI. The first officer's instruments are not driven by GPS mode in this configuration.

This hybrid capability allows seamless use of satellite-based navigation while retaining full INS backup and the original AFCS operational feel. Always cross-check the active navigation source on the GPS unit before engaging or changing modes. Monitor the HSI closely during transitions.

For more information on other Navigation methods, please refer to How to - INS Setup, Operation & Procedures & How to - Simbrief Integration