Poor GNSS accuracy? [Bug 8]

[Nail]

How do you explain this situation?
Start from the same place.

Spoiler

67vs66sr3.jpg

Red 66. Green you know which one.

[GPSrChive]

Do you have the GPX track file from each device?

[Nail]

I send.

[Nail]

Make a test turn on 67 at home and leave it on the window for some time with the recording turned on. Check after half an hour if your vehicle is still in the same place? In my case, it grabs a position and starts slowly moving west with no return. The farthest he went to the neighboring street was 130m. Another test take this turned on device and go outside to see if you were positioned right away? In my case, it happens after a long time. Let me know if you have the same problem? In 66sr he does not appear.
Below is the test view.

Spoiler

67vs66sr5.jpg

[mimichris]

Make a test turn on 67 at home and leave it on the window for some time with the recording turned on. Check after half an hour if your vehicle is still in the same place? In my case, it grabs a position and starts slowly moving west with no return. The farthest he went to the neighboring street was 130m. Another test take this turned on device and go outside to see if you were positioned right away? In my case, it happens after a long time. Let me know if you have the same problem? In 66sr he does not appear.
Below is the test view.

Is it the green trace on the 67? it is totally abnormal. Is this 67 finished or is it a prototype ?

[Nail]

Is it the green trace on the 67?

Yes, the one on the left is 67.
I'm doing a test in a different window now and I have more satellites here and it seems the vehicle won't go away. It's not a problem if the vehicle leaves when there is no satellite coverage, but why doesn't it quickly return when it has good visibility?

[Nail]

I made a test by wrapping 67 in aluminum foil, waiting for it to give a signal about the loss of satellites and walked away a dozen or so meters. I removed the silver for the poor from 67 and proceeded perpendicular to the earlier route. 67 was walking parallel with me, a dozen or so meters away.
66sr the silver wrap test passed excellently did not fall for it.

I did a few more tests and each time the result is the same.
When 67 does not see satellites, when the constellation returns, it does not refresh its position in real time and starts its journey from the last position.

I'm curious, have you also noticed this problem? Am I the only one seeing this?

[mimichris]

I've never seen this on any GPS I've owned and own regardless of brand, either it's the GNSS chip or the software, but it's a serious anomaly.

[987]

I'm curious, have you also noticed this problem? Am I the only one seeing this?

I have seen this on GPSMAP 66st, more rarely on etrex vista and etrex 32x as well.
But, those few times it occurs (less than 1 in 20 power cycles), it is often an start up error, which disappear after 10-30 minutes when fix becomes better.

[Nail]

I'm curious, have you also noticed this problem? Am I the only one seeing this?

I have seen this on GPSMAP 66st, more rarely on etrex vista and etrex 32x as well.
But, those few times it occurs (less than 1 in 20 power cycles), it is often an start up error, which disappear after 10-30 minutes when fix becomes better.

When you turn on 67 in good visibility, it's no problem. It positions itself quickly.