Casio G-Shock Gravitymaster Atomic Triple G Resist GPW-1000-1B Mens WatchCasio G Shock Gravitymaster Atomic Triple G Resist GPW 1000 1B Men's WatchGets data from both atomic clock and GPS signals! This is what you perhaps call the best of both worlds but wait, with aviation; this is the minimum you require if you want to keep up with the modern times and standards. Plus, it shows you the World Time and any two time zones at a glance. That takes care of your every timing need, on and off the flight.