I would think technology is already there and it will be very useful.
Are there watches that automatically change time zones throughout the world(like cell phones) for sale now?
my Casio %26quot;wave ceptor%26quot; watch does.
my Casio WV-59A knows when I am in Chicago or Yellowstone or Pigeon Forge. It does not change immediately, but when the watch goes out to get an update, it changes.
Wave ceptor watches work around the world. The US is not the only transmitter on 60kHz. JJY is also on 60kHz. Soon, there will be another 60kHz transmitter on the east coast of the USA.
Cell phones are set by the cell site. The cell site gets its time via a Network Time Protocol. The NTP comes from NIST in Ft Collins CO with an error caused by the propagation of the network. The time from your %26quot;atomic watch%26quot; is usually more accurate than the NTP source even though they are both from the exact same NIST source.
GPS uses the same NIST source.
NIST = National Institute of Standards and Technology -- formerly the National Bureau of Standards.
Are there watches that automatically change time zones throughout the world(like cell phones) for sale now?
They've been on the market for quite some time now. Abacus is one of the brands that sell them.
The only problem with them is they don't switch time zones as quickly as a cell phone does, it takes about a day for them to switch.
my casio wave ceptor does not. it is self adjusting but you still have to input both the zone and whether the local jurisdiction uses savings time. wave ceptors, like all %26quot;atomic%26quot; clocks only work in parts of USA and Canada that can receive radio from Ft Collins Colorado, they are not a world wide system.
cell phones can because you are never more than a mile or two from the tower, and that clock is set by the local phone company. They take care of the zone and savings time rules, it is nothing that the cell phone itself does.
a gps might be programmable to give local time in addition to GMT as part of its map function. time zone boundaries are quite irregular, the shifts are not all 1 hour even, and savings time shifts occur at different times, even in the same country so the program would have to be updated at least annually to be of any value. but then so would your maps.
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