Yes, re. website not having product listed anymore was also a question I’ve asked two years ago.
Unfortunately no matter what you do with the GPS it won’t fix the problem.
I’ve done some extensive testing back then to see if anything helps:
The underlying issues is that the GPS provides a consistent good data stream but the Navio simply ignores that at times. - This has been confirmed by various data collected and by some others who had the same issue.
It can be so bad with that issue that within seconds of each other you might get a GPS glitch message followed by an IMU glitch message which might then trigger a failsafe response.
- In my case the failsafe (landing mode) wasn’t such a good thing as it happened over trees. (Needless to say would also be bad over water) - As a consequence I’ve changed the failsafe setting in my system.
I also used the 4G connectivity back then. Alright for telemetry but not very useful for video transmission due to the delays encountered in signal processing. (not lined to Navio)
Here is some more info regarding this issue:
…and the list goes on…just search on the Navio forum.