Poor GNSS accuracy? [Bug 8]

[GPSrChive]

Can you make screenshots of every satellites system during this stable phase of 1.5m-1.8m? I would like to compare it with my device.

Please see below.

Spoiler

GPSMAP 67 - GNSS - 5ft - GPS GAL GLO BDS.png

Note: I am not within range of QZSS or NavIC, and have requested help providing screen captures of those constellations for GPSrChive.

[Gadwin]

Hm, I can't really spot a difference and it is really stable this accuracy, so over 10min, 30min, hours? I also receive those four satellites systems with the same amount of bars. I was several days on the same altitude and I had a definitive weaker performance than with my 66sr.

The only real difference is that you are far more south and at the west. Nail is also in europe like me just in a neighbor country and has the same issues like me.

It would to be interesting to see more observations of people on the American continent. Are their accuracy really much better and stable than on europe? Since I don't believe that Nail's device and mine are faulty and our observation aren't just nitpicking.

edit: I saw a comment of somebody on youtube and he cliamed to have 1.5m-2m accuracy, I don't know how stable it was, but he leaves in UK on the left from the prime meridian.

[Gadwin]

Lost the time to edit my post: This same UK guy claimed to know a friend, whose 67i goes down to 1.8m (what I assumed it should can).

But there is a video from the USA on youtube who tests 67i and 66i and 67i had accuracy of 9ft and his 66i 8ft. It is really random.

[Nail]

On the windowsill in front of the window.

Spoiler

GNNS.jpg

[RunnerAndrew]

I have owned my GPSMap67i for a couple of weeks now.
Using in the Hills in Northern UK on the hill tops with a decent view of the sky I tend to be seeing a stable accuracy of around 6 - 7ft as per the attached picture.
In more urban environments outside with buildings either side of me, the accuracy tends to drop to around 9ft.
Hope this helps.

Spoiler

IMG_20230330_124318071_HDR.jpg

[GPSrChive]

Just gonna jump in here again to remind everyone that the reported accuracy is only an estimate and does not indicate actual device accuracy as it is not possible for any GPSr to calculate an absolute accuracy value. This number will fluctuate with GNSS constellation geometry and any number of environmental influences.

[Gadwin]

Just gonna jump in here again to remind everyone that the reported accuracy is only an estimate and does not indicate actual device accuracy as it is not possible for any GPSr to calculate an absolute accuracy value. This number will fluctuate with GNSS constellation geometry and any number of environmental influences.

Nothing wrong what you said, but again, it is natural to compare the 67 with his predecessor the 66sr. What is the reason for the different behavior? What is the reason that I never achieve accuracy of 5ft and 6ft just for seconds?

Again, I am comparing it with the 66sr and I think it is legit to do that. Also see Nail's pictures where 66sr and 67 are side by side and you can see clearly the difference.

I mean I know some people who have also a 66sr and if we hold all our 66sr together, they indicate 1.8m accuracy.

[GPSrChive]

Comparing models is perfectly natural and expected. Just don't want people getting too hung up on a non verifiable variable in a brand new device when compared to a much more mature predecessor that benefits from many firmware and GNSS chipset updates. No doubt in my mind the 67 will equal or outperform the previous models once it has a similar number of software updates.

Until such time, please do continue comparing performance as it will provide future documentation of continued improvement with each new device update!

[Nail]

Comparing models is perfectly natural and expected. Just don't want people getting too hung up on a non verifiable variable in a brand new device when compared to a much more mature predecessor that benefits from many firmware and GNSS chipset updates. No doubt in my mind the 67 will equal or outperform the previous models once it has a similar number of software updates.

Until such time, please do continue comparing performance as it will provide future documentation of continued improvement with each new device update!

However, it seems that the reported accuracy corresponds to what is happening in the field. If you're 5ft that's great, I've seen one too when I stayed outside for a while. On walk the accuracy was 7-10ft. Perhaps the new chipset needs tuning to specific regions?

I sent a large amount of information for analysis by Garmin regarding the accuracy of the new GPSMAP 67. I also reported the other problems discussed earlier. I hope that the tests will contribute to faster intervention of Garmin engineers. The new GPSr stressed me a lot, but I'm still interested in having it. Now I will wait for the development of the update and when I am convinced that everything is fine, I will purchase it again.

[GPSrChive]

Nail, I know this was not your first Garmin, as you have also the 66sr. Most experienced Garmin users are aware new models always have some refinement to go through during the first year or two after release.

I'm certain they will get it sorted.