It’s not just some fitness smartwatch, as the linked Tweet might lead you to think:

> Pilots told the tech website that they had not been able to download new Garmin software with up-to-date versions of the aviation database, which is a legal requirement for flying. The Garmin Pilot app, which is used to schedule and plan flights, was also hit by the attack.

Source: https://news.ycombinator.com/item?id=23937097

PS in case you’re not into aviation - Garmin is used in smaller aircraft, not airliners but this is still a significant disruption - smaller planes and helicopters carry out important roles such as firefighting, heli ambulance, flying doctors services (e.g. in Australia) rescue ops etc.