GPS position off outside of United States
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Issue with MSFS 2020 Flight Plan Navigation Outside the USA
I've noticed some strange behavior when flying outside the USA in Microsoft Flight Simulator 2020 using the default flight planner and the UNS-1 FMS.
When I create a flight plan for a route within the USA, the aircraft follows the plan perfectly using the autopilot and FMS. However, when flying routes outside the USA, the aircraft often deviates significantly from the planned path — it's almost as if the GPS thinks the aircraft is in a different location entirely.
For example, I created an IFR High Altitude Airways flight plan from Tunis (DTTA) to Cagliari (LIEE). The plan loads into the UNS-1 FMS without issue, and after takeoff, I set the autopilot to follow the Beam. The NAV display shows 0 TKE (Track Error), which suggests everything should be fine.
However, as you can see in the screenshots, while the FMS seems to believe the aircraft is on course, the actual aircraft position is far off the intended route. The HSI appears aligned with the path, but the aircraft flies in an entirely different direction — in this case, between TOBIB and TANIT.
This misalignment seems to persist throughout the entire flight and is not limited to this route. I've experienced similar issues in the UK, Europe, and APAC regions. Strangely, everything works perfectly in the USA.
Has anyone else encountered this? Is there a fix or known workaround?
Screenshot 2025-04-22 160040.jpg
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This isn't behaviour we have seen on our side or have seen previously reported. Could you kindly raise a ticket with Just Flight Support at the following link and include information such as the flight plan the behaviour was observed on, and which AIRAC cycle nav data is being used at the time? That will then allow our support team to attempt to replicate this.
https://www.justflight.com/support
Mark - Just Flight
