I'm not sure how many hours you have, but you're really not going to use any of these features in the airplane in the real world, I know, I know, but what if XYZ fails, yeah, nope, you won't use them, hence why you see so many people selling those stupid garmin watches now.
That said, GPS watches have some great benifits for some outdoors sports and hunting and the like, they do have to be charged often, but if you want a GPS, compass, baro watch a suunto is the top dog, doesn't say pilot on it, or have a half arse HSI, but it's really the best when it comes to this type of hardware, it's also made with a sapphire lense and in Europe, not a Chinese watch.
Suunto Traverse Alpha Foliage ? the GPS/GLONASS outdoor watch
Hiking, Fishing and Hunting modes
Sunrise-sunset times and alerts
Fishing and hunting specific POI types
Moon phases and moon rise/set times
Automatic Shot detection
Red backlight, Night Vision Goggle compatible
GPS and GLONASS for route and POI navigation
Real-time breadcrumb view of the recorded track
Tracking for speed, distance and altitude
Route planning in Suunto's Movescount.com with topographic maps
Route preview and route altitude profile on the watch
100 m/330 ft water resistance
Altitude (FusedAlti™)
Weather trend and storm alarm
Compass
Backlight in flashlight mode
Vibration alarm
GPS time update
Daily, weekly, monthly and yearly activity tracking of steps and calories
Mobile notifications
Compatible with Suunto Movescount App (iOS and Android
I'll add that even though I really like these types of watches, day to day and in the cockpit at work I wear Swiss mechanical and automatic watches.