GPS is not reflecting correct position (resolved)

[Sdatch 1]

XPlane 11.55 with RealityXP Garmin GTN 750/650 2.5.28.6. The GTN650 GPS shows me 0.5 miles away from my location. The location is accurate on Foreflight which is getting the location from XPlane11. How do I correct this issue? I have uninstalled and reinstalled both Garmin Trainer and RealityXP and installed GTN with the trainer option. 

The GPS used to be accurate. I cannot tell when this stopped working properly. I suspect and update.  

[RXP 2,338]

Hi,

This is peculiar indeed.

- What location is this more specifically?
- Is there any chance you could post side-by-side screenshots?
- Did you by any chance enable a few GPS failures which are meant to alter the accuracy?

[Sdatch 1]

Xplane is telling ForeFlight that the coordinates are  35.21N 84.80W which is accurate at KRZR

GTN 750 says the coordinates are: 35.12N 84.47W which is 0.3 miles from KRZR

Is there a Dataref problem? Both Foreflight and GTN 750 show the altitude as 832' which is accurate for field altitude.

 

No failures have been enabled.

[Sdatch 1]

Really could use some support on this issue. How to troubleshoot?

 

How do I confirm what dataref is being used by GTN and which should it use from XPlane 11?

 

 

How can I downgrade to a previous version?

 

I have turned on both 750 and 650. The 650 is showing the correct location while the 750 is not. Please help correct this issue on the 750.

 

[RXP 2,338]

Hi,

I've been looking at potential explanations but there is none that I can think of at this stage, especially given both the GTN 650 and GTN 750 are using the same database files, except a corruption in the GTN non-volatile memory file.

I'd suggest you do the following:

- Read the RXP GTN User's Manual chapter "Device Embedded Memory" p18

- Make a backup of the non volatile memory file corresponding to the GTN 750 unit you're using (different files for unit1 and unit2)

- Delete the file and load the aircraft with the GTN so that it re-creates a genuine one.

Hopefully this will solve the problem.

[Sdatch 1]

The issue appears to be with GTN 1. Regardless of the GTN model that I put in GTN1 it shows the wrong position. But if I put GTN 650 or 750 in GTN 2 it displays the correct position. I need the GPS to work in GTN 1 because that drives my G5 display for localizer and glide slope/vertical (using Air Manager 4.1.1)

[RXP 2,338]

@Sdatch have you tried re-constructing the non volatile memory file?

[Sdatch 1]

That fixed it! Thank you!