My watch won’t pick up GPS

I recommend soft-resetting the watch - sync, then hold the Light button for some 30s till it shuts down (do not release the button when the emergency alert appears!). No worry, no data or settings gets lost with this type of reset. Then start the watch and connect it over the USB cable to a computer with Garmin Express, delete the CPE or EPO file in the folder //GARMIN/RemoteSW/ on the watch, and then check for updates in Garmin Express. When the watch is fully charged, disconnect, (if prompted for updating the firmware, let the procedure complete), and then soft-reset the watch again.

If the suggestions from trux or this FAQ Why Is My Garmin Watch Not Acquiring GPS Satellites? do not resolve the issue, please reach out to Product Support for further investigation.