http://gizmodo.com/garmins-d2-gps-watch-puts-an-entire-cockpit-on-a-pilot-1442416552

Available sometime in November for $450, the D2 comes with a
built-in worldwide aviation database allowing pilots to not only locate
landmarks like airports, but also plot courses and fly-over waypoints from their
current GPS-determined location. The watch also features a highly accurate
altimeter, barometer, and compass, and even features custom alarms to let a
pilot know if they've inadvertently descended too low or gone off course.

Garmin site
here.