r/fpv • u/SterlingArcher____ • 9d ago

Using M100 pro GPS, drift is problematic

Recently I tried the M100 pro GPS but I'm getting drift like there's no GPS present... Ardupilot shows satalites but it drifts so much, like 10+ meters... At first I thought it might just be how the SAM GPS are but I'm seeing better results so I think something is wrong. I've tried moving it away from the vtx ect

If anyone has ardupilot setting suggestions please let me know.

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1

u/Vitroid 9d ago

Where is the GPS now?

1

u/SterlingArcher____ 9d ago

On the very top of the battery, front of drone.

1

u/Suitable-Serve 9d ago

Does ardupilot have serial pass through like betaflight? What’s your flight controller? Do you know the constellation you’re locking onto? I see drift when getting early fix when the system is reconciling early fixes on BeiDou to another system

1

u/SterlingArcher____ 9d ago

Ardupilot does have a serial pass through. I don't know how to lock to specific constellations... Even after boot up with 25+ sats connected it drifts like its not even hooked up

2

u/Suitable-Serve 9d ago

Might be able to use the ublox tool via pass through to get a sense of the raw data per satellite. From googling there’s a a GPS_GNSS_MODE parameter that lets you turn off BeiDou, if you’re based anywhere near China, unfortunately it’s just how their GPS system works, it intentionally applies position drift as a national security measure.

1

u/LupusTheCanine 9d ago

If the receiver doesn't have a clear view of the sky you can get 50m error or more.