Casio G-Shock GRAVITYMASTER Twin Sensor GA-1000-1A Men's WatchCasio G Shock GRAVITYMASTER Twin Sensor GA 1000 1A GA1000 1A Men's Watch This is the first GRAVITYMASTER ever to come out. Equipped with a digital compass, it is the perfect watch for the modern aviator, for it also allows a continual direction reading, indicating both literal direction and direction angle value. The results can be stored in the bearing memory. It also reads temperature and theres a black LED illumination that comes quite handy in the