Has anyone tried the coros pace3 recently launched, is it compatible with the gpsspeedsurfing site? They haven't updated site for a while. I am looking for low cost basic but accurate watch. Had Garmins and found inconsistencies against friends with garmins. Water ingress killed my last Garmin.

The speedsurfing mode is only available on the VERTIX 2, APEX 2 Pro and APEX 2 in their current ranges.

support.coros.com/hc/en-us/articles/360056638451-Supported-workout-modes-on-COROS-watches

There would be nothing stopping you from exporting the FIT file from the COROS app and manually uploading that file to GP3S though.

Just be sure to use the FIT file and not the GPX which doesn't include the doppler speeds.