67 vs 66sr - Accuracy

[gpsjorgen]

Where do you get idea that GPS data if dismissed if standing still? It's not.

Simply, because the coordinate as displayed wanders hundreds of meters away from your real position when standing still under not ideal conditions (as has been reported multiple times in this thread). This never would have happened if the GPS data (error ~ 5m) would have been taken into account.

Apparently when you switch off-on the device or GPS reception, it reinitializes and uses the GPS signal, because the coordinate shown jumps back to your actual location.

Routes will newer coincide because reception conditions differ in both directions (antenna positions are not identical, weather is not identical, satellites drift). In my opinion data gives some indication of precision, but these are only 2 tracks with 2 different models in different conditions. What would these test show if instead of [Fenix 7/67] combo [Fenix 7 & Fenix 7] or [67 & 67] were used?

With all due respect gps_techie, I believe you did not read my post properly. But of course you are right.

The image was meant as a typical example of my observation, right.

As I explained I compared 4 hikes (roughly 16 hours of hiking, 8 hours one way, 8 hours back) and counted the deviations between to and fro routes of each device larger than 10 m *). Fenix shows 7 of such errors, GPSMAP shows 24 (more than three times as much!). To me this is statistical evidence that the GPSMAP performs worse. Once the deviation was more than 40 m on the GPSMAP.

*) Why 10 m? Well, we need some limit in this experiment. Under ideal conditions the accuracy is 1.8 m (which means almost all points displayed/measured by the device lay within this distance from your real location). Given the tough conditions 5x this distance seemed a fair limit. So though it is arbitrary, it is an educated guess.
I counted the situations as shown in the picture: for some time the difference between to and fro is larger than 10 m. Not individual points. I did not take into account the real difficult situations, like tunnels or full enclosures.

GPS reception is very tough in such conditions.

I would expect the GPSMAP to perform better, because the sales pitch of Garmin states the external Quad Helix antenna is meant to give better performance exactly in this type of conditions when there are reflections of the GPS signal.

I bought the GPSMAP 67 for this very vacation, but it rendered less reliable than the Fenix 7. So no reason to keep it

[venci67]

In my opinion, the main problem with the GPSMAP 67, 67i is that Garmin, in order to make it energy efficient, tried to make a working tourist GPS from watch parts, but they didn't succeed .
Another thing that impresses me about their car navigators is that with the same map, different models calculate the route differently. I've never understood why they try to implement a new algorithm for calculating a route every time for each new device, 100% of the time it's the same with their tourist devices. Is it so hard to use something that works for all their devices, and instead they make some loose ends every time and then try to make them work properly with the help of new software updates.
And in conclusion, the worst thing is that they don't even bother to fix things anymore, the fact is that they haven't released a new firmware for 67 in an attempt to improve things for months. Whether it's impossible to fix or they just don't care, only they know, but out of respect for the people who bought their product, they have to at least try.