I really like articles that explain why the rules are the way they are, because when you understand the reasoning behind the rules, the rules become both easier to remember and easier to follow. So why do we have Class E airspace? If you don't have to talk to anyone, why is it different from Class G?
We get GPS interference testing NOTAMS in the Western US all the time, but this is the first I've seen that runs all the way down to 50AGL from the Bay Area to San Diego. At 10,000 and above, this NOTAM may affect flights from Southern Oregon all the way to Eastern Arizona.
If you're a California pilot wondering why this is different, the other GPS interference NOTAMs seem to be generally be caused by Air Force operations outside Nellis AFB in Nevada. The epicenter of this NOTAM is the China Lake Naval Air Weapons Station in central California. Looks like they're working on some new satellite navigation jamming systems for the EA-18 Growler (or jamming defense systems). Time for everyone else to brush up on pilotage and dead reckoning!