This. It's been nothing short of amazing for me. It's solar powered and atomic so it's always in perfect sync. You can handle multiple time zones at once (so I have UTC up while flying along with local time). You can punch in different cities to get the time code, has a compass (not too shabby), altimeter, and barometer. There's something irrational and calming about having that as redundancy even though there are a million better ways to handle any potential failures.