Navy issuing F/A-18 pilots Garmin watches to alert low cabin pressure (2017)

Apparently a pilot was able to use his Garmin to track altitude and heading after his cockpit instruments and windows iced over:

https://www.defensenews.com/breaking-news/2018/02/23/flying-...

The watch is a Fenix-3. I have a similar model (the 935, which is based on the more recent Fenix-5). The watches have a barometric altimeter and a magnetic compass, which I assume is what was used, not the GPS. I'm still amazed this worked.