Ambient Weather AT773 Wrist-Top Computer Watch with Altimeter, Barometer, Compass, Thermometer, Time, Tide, Sunrise, Sunset, Moonphase, Ski Function The AT773 is versatile wrist-top computer watch with altimeter, barometer, compass, thermometer, and stopwatch. The watch also calculates sunrise, sunset, moon phase and tidal information. The calibratable altimeter measures current altitude, high and low altitude memory, total altitude gain and loss, number of hills and includes a graphical interface. The wrist-top computer measures barometric pressure and displays absolute and sea level pressure, and forecasts weather based on rate of change of pressure. The electronic magnetic compass guides you with a 16 point cardinal compass and displays 1 degree resolution. Includes a declination correction feature for upmost accuracy (declination is the difference between magnetic north and true north). The AT773 features Electro-luminescent backlight, user-replaceable battery, and large, bold silver housing with decorative (non-functional) winding mechanism. The case is water resistant, and includes 1-year factory warranty.