Later, Garmin put up a red banner on their UK website officially acknowledging the issue: "We are researching reports of devices displaying a blue triangle when starting a GPS activity.

Garmin still hasn’t confirmed what caused the “blue triangle of death” issue on its smartwatches but now suggests several ways to fix affected models.

If your Garmin watch is showing a blue triangle, you’re not alone—users of Forerunner, Fenix, and Epix watches have been reporting this issue since January 28, and Garmin is looking into it.

A red banner on Garmin’s US and UKwebsites addresses the issue. The message states that they are researching reports of devices showing a blue triangle when starting a GPS activity.