Altitude not working inav

[KeithD56]

Hi, I have very little experience setting up
I setup my swordfish fixed wing in inav 9. All works OK except some telemetry. I have a GPS, compass not connected. It show 20 Satellites and locks giving my longitude and latitude correctly. Looking at sensors I get a responsive bar reading but no altitude, stays at zero. Any help very much appreciated . Keith

[wilkersonp]

Fused altitude will stay at 0 until the vehicle is armed. If you are having issues with baro altitude bouncing around and flipping sign, investigate whether you have two barometers (one of which would be built-in to your GPS module) and whether they have the same I2C address. If you do, then you'll either have to physically remove one, or possibly remove a resistor to change its I2C address and then recompile the INAV firmware to reflect the change. To run the modified firmware, you will need the developer version of the INAV configurator, which skips the process of verifying that the firmware file is a known build for security reasons.

Hopefully that helps!

[KeithD56]

Many thanks KD

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On Thu, 12 Feb 2026 at 03:39, Phillip Wilkerson ***@***.***> wrote: Fused altitude will stay at 0 until the vehicle is armed. If you are having issues with baro altitude bouncing around and flipping sign, investigate whether you have two barometers (one of which would be built-in to your GPS module) and whether they have the same I2C address. If you do, then you'll either have to physically remove one, or possibly remove a resistor to change its I2C address and then recompile the INAV firmware to reflect the change. To run the modified firmware, you will need the developer version of the INAV configurator, which skips the process of verifying that the firmware file is a known build for security reasons. Hopefully that helps! — Reply to this email directly, view it on GitHub <#11300 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BIGWPZZLADAW2MKTULMEXCT4LPYWLAVCNFSM6AAAAACTL4DPRCVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTKNZXG4YDMMA> . You are receiving this because you authored the thread.Message ID: ***@***.***>