One thing about GPS is that the system is under the direct control of the U.S. military. They might decide to mess with it if there was an operational reason for doing so. More remote possibilities would be damage to the system from solar activity or electromagnetic pulse from an atomic bomb above the atmosphere. North Korea is probably capable of the latter sort of vandalism if it found itself under attack.
Don't know how the Europeans are coming along with their system, but it won't be infallable either. No I don't think satellite system failure is very likely, but if I were setting off for a trip around the world, I would definitely be packing a sextant. Steve Thomas C&C27 MKIII Port Stanley, ON
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