GPS overlay coordinates jump around wildly on GoPro Hero9 Black on Labs 1.72.70

[nanophilip]

The GPS coordinates shown on the overlay jump around wildly, about 50 kilometres of latitude and two hundred kilometres of longitude. Even when the GoPro does not move. The GPS coordinates extracted from the video are are highly accurate and precise to several metres. Time and date on an overlay also show just fine. I assume the code for displaying the GPS coordinates on the overlay is bugged.

Interestingly, the coordinates are updated with a frequency of about 20 Hz on the overlay (rough estimate going through the video frame by frame), but only 8 Hz in the extracted data.

Another issue mentions the same problem on a Hero8.

This webpage lists three older Labs firmware versions for the Hero9, 1.70.70, 1.60.70, and 1.52.70. (I assume 1.42.70 is a typo and should be 1.72.70.) Could you please provide the older Labs firmwares for the Hero9 so I can test if the problem exists there also?

[dnewman-gpsw]

Older firmware is in this repo. Just click on code on this page and look for firmware. However GPS got better with later models, so this is not likely a bug. The GP1 used 18Hz, but single system, later models used an updated receiver for 10Hz fused dual system for cleaner data.

[nanophilip]

The GPS position coordinates extracted using https://github.com/JuanIrache/gopro-telemetry from videos I took with a Hero9 is accurate. But the overlay on the Hero9 screen (that is burned into the video) shows very different coordinates that jump across hundreds of kilometres on every update tick.

There are multiple firmwares for the Hero10 and newer models. But for the Hero9 and older I can only find the latest version. Could you please have a look too, and if possible, arrange for older Labs firmwares for the Hero9 to be uploaded?

https://github.com/gopro/labs/tree/f7eef309ee99c5d5b55aad0926bdb38a479ab25a/docs/firmware/lfs

[dnewman-gpsw]

That extracter is likely filtering the data, something doable it post, harder to do live. I don't think the older will help. This in the oldest I can find https://www.dropbox.com/scl/fi/go3mi1sp5ect7ur6i65r8/LABS_HERO9_01_60_70.zip?rlkey=f20r9osuuhthhgdoyjjzwgk6q&st=wvqw0j5v&dl=1

[nanophilip]

Thank you, this firmware indeed fixes the issue. The GPS position coordinate are now correctly shown in the overlay. But I did experience some total device freezes which I could only end with holding the power button until it shuts off. I never had that with Labs 1.72.70 or stock firmware. I will test it further.

Could you please try to provide the 1.70.70 too? Then I could check if that one has the GPS overlay bug as well.

[dnewman-gpsw]

This was the only other release https://www.dropbox.com/scl/fi/hfhjf3amtfcgv6f0gxs5a/LABS_HERO9_01_71_70.zip?rlkey=uf4xo0kjvlkb1r6vm0aes9h70&st=e8nwc15o&dl=1

[nanophilip]

Thank you. With that firmware, 1.71.70, the coordinates are also not shown correctly, but instead are jumping around wildly. Like they do on 1.72.70.

To recap:
1.72.70: does not show GPS coordinates correctly on the overlay
1.71.70: does not show GPS coordinates correctly on the overlay
1.60.70: does show GPS coordinates correctly on the overlay

I will test if 1.60.70 does have any bugs that affect my use, and will stay on 1.60.70 if not.