Watch no longer tracks distance when in bike mode.

att: Garmin-Christopher Luke_ODQA Garmin-Jimmy

Could you post a link to the concerned activity? Was GPS on and locked, did the watch record the track?

https://connect.garmin.com/modern/activity/9154933531  The activity is private, but I grant garmin employees and contractors permission to look at it for debugging purposes.

I don't know how to answer your questions, but it was giving me speed data which I assume comes from GPS.

NH said:

The activity is private

You have to make it public, if you want someone here on the user forum looks at it. If not, contact rather the Support directly.

NH said:

I don't know how to answer your questions, but it was giving me speed data which I assume comes from GPS.

It is simple - look at the activity. If it contains the track on the map, then the GPS was active. If the track corresponds to the reality, then it was locked and working properly.

BTW, do you use a speed or cadence sensor? If so, was the battery still ok?

No, I don't.

There is no map displayed on the website.

In that case, the next time you have to start, only once the GPS is locked (checksign in the round field). Your CPE file was possibly expired or corrupted. Restart the watch, then connect it to a computer with Garmin Expres, and check for updates

I don't know what a CPE file is, and I have a linux computer.

I have also tried to make sure the GPS was locked before I started the activity for debugging purposes, but that was previously not a requirement for it to work.