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I am disturbed that too many people use GPS without recognizing that it could 
become disabled. I still think that practical knowledge of celestial 
navigation should be a requirement for any navigator. I just found this:

http://www.newscientist.com/article/dn10189-solar-flares-will-disrupt-gps-in-2011.html

Civil engineers have long used the idea of "100 year floods" to design 
drainage systems. The idea there is to allocate resources wisely. I wonder if 
GPS is designed to survive a "100 year solar storm"?

I tell my students that, "When the batteries go dead, you still need to know 
where you are." That's to get their attention. But it is the truth. And, if 
GPS were to become useless, you would still need to know where you are.

I spent my career creating interplanetary spacecrafts, and I know first hand 
the many ways that they can fail. We think that our first one, Mariner 2, was 
hit by a meteorite, but we didn't have enough instrumentation aboard to tell. 
There are many hazards out there, not all of them known.

I'm finding that common sense is not only not common enough, but is impossible to sell.

Jim Wilson


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