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Re: GoPro GPS not working? - Performance stickers and telemetry FAQ
The GPS antenna on the GoPro is very sensitive to mounting positions and signal conditions, so compared to other devices it's not super reliable.

In good conditions, however, it's pretty accurate and has a very high frequency for the price (16-18Hz while most consumer devices have 1Hz, 10Hz at best), so it also has its advantages.

Personally, when the GPS data is important I don't rely solely on the GoPro. I at least record a backup track with a phone or smartwatch.