If your Garmin watch is showing a blue triangle, you’re not alone—Garmin has acknowledged that other users are experiencing this, and has published instructions for fixing it. The issue affects several models of watch,

Garmin’s instructions seem to suggest that devices will need to be factory reset if a power cycle does not work. Reconfiguring a watch from scratch would be inconvenient, so it might be worth waiting to see if Garmin can issue an update that resolves the issue. If you cannot wait too long, you might just have to go through the hassle.