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FR 235 keeps recording inaccurate distance

During the run, it is consistently underreporting my distance/pace (I'm very familiar with the approximate distances in my neighborhood). But when I download the run, it appears that anywhere from the last .4-1 mile of my runs are missing from the map (note: I always finish where I started). Also notable is that around when the missing distance starts on the map, the elevation just flattens out and appears to stop registering.

Here are some examples:
https://connect.garmin.com/modern/activity/6939475921
https://connect.garmin.com/modern/activity/6927492831

Any suggestions on how to fix this would be greatly appreciated!

0 BunBun! over 2 years ago

A wrong pace occurs when GPS is lost, if it happens rarely, then just turn off and on a watch sometimes and sync with Connect.

It can be also a problem with high buildings or dark forest.

0 d0ugh2k over 2 years ago in reply to BunBun!

The watch does not indicate GPS is lost - it continues to register pace and distance (inaccurately) in real time, but then when I download the run afterwards, it's missing the last part of the run.

0 BunBun! over 2 years ago in reply to d0ugh2k

Well yes, the watch can register pace and distance also using accelerometer (but not as accurate as with good GPS) and on standard view there is no status of GPS - it only pop-ups at the start.

Rarely when it was lost completely, and recovered later - it drew a straight line from point where lost to point where recovered. If you end an activity during that, then it will just end at lost point.

You can download a DataField from the Apps site for GPS status, then add it by Connect IQ menu to view it in real time. There are 5 possible values of GPS accuracy:

0 NOT_AVAILABLE
1 LAST_KNOWN
2 POOR
3 USABLE
4 GOOD