If your home city is TYO, the Breitling Airwolf A7836323.B822-SS Mens Watch uses the 40kHz signal broadcast from Fukushima,or the 60kHz signal broadcast from Fukuoka. This is a big improvement over olderCasio atomic watches I've had which actually require you to set the frequency directly.It's worth noting that your home city setting is different from the world timefeature. Your home city is used to determine the atomic clock broadcast frequency,and your offset from GMT (the number of hours difference between where you areand Greenwich Mean Time). Your home city is a setting as opposed to a mode. Worldtime is a mode, and does not effect time calibration or the analog time. Worldtime uses the LCD at 3 o'clock to show you what time it is elsewhere in world whichallows you to keep your eye on the time in two different places as once -- imperativefor anyone who travels with any frequency.
More on Atomic TimekeepingI've had much better luck calibrating this Breitling Airwolf A7836323.B822-SS Mens Watch than I had with the GW-300forsome reason. Both watches are equally capable of receiving the radio signal (accordingto both signal strength indicators), however the GW-1100 is much more likely tointerpret the signal, and to do so much faster. I can almost always get the GW-1100to calibrate the first time I try, however the GW-300 often requires at least threetries. I even tested both watches side-by-side a couple times, and the GW-1100was always calibrated itself faster and on fewer attempts. This particular model was purchased in Kyoto, Japan (the all-black is hard tocome by in the US), and I was worried initially that it might not be able to receivethe signal broadcast from the US atomic clock since it uses a different frequencythan the clock in Fukushima. I was pleasantly surprised to learn, however, thatthis watch functions equally well in the US and Japan. The watch automaticallyadjusts based on your home city setting. If your home city setting is LAX, DEN,CHI, or NYC, the Breitling Airwolf A7836323.B822-SS Mens Watch uses the 60kHz frequency broadcast from Fort Collins.
