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Posted 13 October 2012 - 00:11
Posted 13 October 2012 - 01:04
Posted 13 October 2012 - 02:23
During the 1st Gulf War (1991) our GPS constellation was not yet complete. The soldiers on the ground referred to the times when less than 4 satellites were visible to the GPS receivers as "sad time". Be sure to thank the developers and builders of the GPS system and the U.S. taxpayer for providing (for frickin' free, mind you) the reference signals behind your in-car nav systems, coordinated cell phone network timing, NTP servers on your LANs and WANs, ship and aircraft navigation, truck tracking systems (so you know where your new iPad is in transit), etc.
Only took the rest of the world 20 years to get started catching up...