Ever wondered what the most accurate watch in the world is? It's probably not what you think.
You might guess a radio-controlled quartz watch like the Casio G-Shock Gulfman, or the Citizen Skyhawk. That's a good starting point. Atomic watches are very accurate if you can receive the radio signals. But there are large portions of the world where they don't reach (Central/South America, Australia, New Zealand, Russia, the poles, out on the ocean — even plenty of places that are technically within range, but for whatever reason, not conducive to signal penetration).
Another possible answer is a GPS watch like the Suunto X9i which works almost anywhere on the globe. Unfortunately, it has very limited battery life, and doesn't sync automatically.
http://www.watchreport.com/2008/04/the-most-accura.html
