GPS Issues?

Shepherd

Shepherd

Final Approach
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Nov 24, 2012
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Hopewell Jct, NY
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Shepherd
Flying back from Nashville via Bristol parallel to rt 81 and all 3 devices in the plane are losing GPS lock every 15 (ish) minutes. Anyone else in the air in this area seeing anything?
 
I didn't plot it on the chart to see if it effects your area but maybe this has something to do with itIMG_8292.PNG
 
Wow. How did I miss that?
Oh, right. Rampant dumbazz.
Glad I have a plane full of paper maps.
 
I would have missed that too. 325330N1060456W (32 53.30N 106 04.56W) is centered in NM and BNA is well beyond the 10000 AGL 250 NM radius.
 
So what/who is the cause of this?

It looks like it is being blocked/disrupted from the ground as the radius increases with altitude. And wow, even at 50agl it reaches out 186nm!
 
White Sands area of NM just about has a constant NOTAM on the military practicing GPS jamming. This seems to happen about every other time I go to Las Cruces, NM. I defeat the jamming by flying below the mountain ridge west of the restricted area.

I don't know why they need to practice so much. Their jamming equipment works very well.
 
There has been some enhanced solar flare activity latey. I've heard of those causing GPS accuracy issues before for differential GPS processing like aerial mappers use, but don't think it was bad enough to zonk out a Garmin.
 
What is weird is that it is for so many areas.

So what do the airlines do when they transition through a non-GPS area?
 
Car battery, antenna, $25 in other parts, jam GPS over 25 square miles. The signals are pretty low power - that's why some weapons have alternate guidance sources.
 
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