Go back to my orig post the FCC has given the go ahead .. to late ? On Wed, Feb 2, 2011 at 9:57 AM, Bob Camp <[email protected]> wrote: > Hi > > Let's see, a 13 mile circle is pi r squared = ~ 530 square miles. > 40,000 times 530 is ~ 21 million square miles. > Wikipedia tells me that the area of the US is 3.79 million square miles. > > On that basis, there's not going to be anywhere in the US that you *can* get > GPS to fly a plane. Jamming detected = could be a problem = you can't trust > it. > > I suspect that there indeed will be remote parts of Alaska or the like that > you will indeed still have un-jammed coverage in a plane. > > Now for the "best case": > > 5.6 miles loss of fix = just under 100 square miles. That's 3.94 million > square miles of jamming. That's still greater than the area of the US. I'm > sure we'll have some left over to jam Canada and Mexico as well. Again, > there will be patches where you can get a fix, but they will be the > exception rather than the rule. > > File an IFR flight plan based on any of this - no way. Insure an airline > that does that - no way. Run an airline based on "VFR only" not going to > happen. Is everything GPS based - no, but there's a lot of the country where > it is. > > Not at all clear how you will keep aviation going under those conditions > unless Lightsquared replaces all their gear with *type accepted* > replacements. Where do I sign up for my free gps? > > Let's suppose they have big pockets and do all that. > > At the consumer level, you have 128 thousand square miles with urban canyon > issues. Good bet that's every place with an urban canyon in the country. > Essentially cross off GPS in every large city. > > Out here in the sticks, things are a little better. Only a bit over 17 > thousand square miles lost. Except ... do you have any hills or mountains > near you? Back to the paragraph above if you live anywhere other than > western Kansas. > > Why are they setting this up - to get internet to people. Where are the > transmitters going - where people live. The consumer numbers may not sound > as bad, but there's a lot of country that is pretty empty. Look at any cell > coverage map to get a good idea how much. You still nuke a lot of voters > with "only" 17 thousand square miles. Not to mention fire, police, EMS, and > the DHL guy. > > Then you have the federal law about 911 tracking on cell phones. How does > that work - GPS. Under what conditions - worse than an urban canyon (no sky > at all). You *at least* have the urban canyon area to deal with and likely > worse. Any bet your cell phone GPS is as RF rugged as the one in your car? > I'm not taking that bet. Bop up the coverage area a bit more. > > So average urban canyon with airborne and what do you get - just a bit over > a half million square miles. My guess is that's the whole area of the > country that has a population dimensioned in multiple people per square > mile. > > So we have: > > 1) Multiple Airplanes running into mountains > 2) Many houses burning to the ground > 3) Lots of 911 calls getting miss directed and people dying as a result > 4) Joe six pack getting lost on the way to the beer store > > All could be what nukes this. I'm betting on number 4 ... > > Bob > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >
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