The GW-300 is equipped with an internal antenna which receives timecalibration signals transmitted by an atomic clock on Fort Collins, Colorado.That means assuming you live in an area where the radio signal is detectable(most of North America), you never have to set your watch, and it will alwaysbe extremely accurate.World time. Easily check the time in 30 different citiesaround the world (29 time zones). The atomic timekeeping feature also works fairly well, though sometimes it canbe difficult for the watch to pick up a strong enough signal for a long enoughperiod of time that it can calibrate itself. It will attempt to calibrate fourtimes a day (2 a.m., 3 a.m., 4 a.m, and 5 a.m.) since it assumes that you willbe asleep and motionless during one of those four attempts. Actually, the manualrecommends taking the watch off before you go bed and leaving it in a positionwhere it can easily pick up the radio signal, however I have found that whenI am upstairs in my house, the watch will calibrate evenwhile on my wrist just about every night.Time recorder.Auto light. If you often need to see the time in the dark,but might not have both hands free (maybe you carry around your baby forhours in the dark trying to get her to fall asleep), turn on the auto lightfeature, and all you have to do is tilt the watch toward you more than 40degrees, and the backlight will automatically illuminate. Sometimes takesa few tries, but it usually works pretty well.Power saving setting.
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