Good morning all! This is my first post, but I am a long time observer of this forum and a long time Casio watch 'accumulator'; I don't really think you could call what I have a collection since until very recently it has been unfocused. I operated following the 'break a watch, buy a watch' method of accumulation .
I work in an industry that is ruled by time (GPS-based surveying and precise positioning at a very large commercial airport). As a matter of course I try to wear accurate time pieces at work, and I've found that Casios fit that bill nicely.
Recently I picked up a few Casios that do the atomic time signal synchronization - a GS-1100, a GW-503, a very underrated non-G Shock WV-200 and just yesterday a Riseman GW-9200. I think time signal synchronization is a very neat trick. Casio has done a great job integrating the technology into their products.
Howerver, atomic time signals broadcast via radio are quite limiting. From a global perspective the signals are very restricted in coverage (particularly in local daytime). What happens if you are in South America, or Africa, or the vast regions of China, Russia and Eastern Europe that are not covered by broadcast time signals?
So here's my question - why not GPS?
I am well aware of the issues related to integrating GPS into consumer devices like smart phones. GPS receivers are getting smaller and smaller with each generation (the GPS receiver in the iPhone is less than 4mm x 4mm in size). Antennas are often the limiting factor; it is very difficult to make an efficient GPS antenna that fits into a small space. However, these antenna challenges are directly related to the need to track three or more satellite signals to determine position. If all we are after is the highly accurate and precise time signal from the atomic clocks carried aboard each GPS satellite then all we need to do is track and synchronize with one satellite signal. This greatly simplifies the receiver and antenna requirements.
Since there are always GPS satellites overhead this would eliminate the coverage and time-of-day issues related to synchronizing with the broadcast signals. This makes the concept of the 'atomic' watch truly world-wide and 24/7.
Are there any indicators from Casio or other watch manufacturers that they are investigating this technology, or has it been looked into and it's just not feasible?
Thanks, and it's good to be aboard!