REFLECTOR: NextGen NAV

Sat Dec 1 21:36:08 CST 2012

They do that kind of jamming in white sands (Holloman AFB), and up by Pueblo Co. Sometimes, both at once. Many times they attempt to make the jamming directional (although they won't tell the general public that). They do this for target purposes as well as to minimize serious outages for the public. Sometimes, they just turn it on and jam everything. 
They do have to put a NOTAM out for it. The problem is, us controllers may not get the NOTAM on our "new and improved" system. Rather, if we get a few reports, we have to go digging to find out what is up. 
I have had FSS inform me of these NOTAMS when calling for a briefing. Sometimes on the computerized ones, they just don't show up.

Best to always have a plan B... or C 

Kurt Winker
Albuquerque Center. 

-----Original Message-----
From: Mark Magee <edjonesbrady at gmail.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Sat, Dec 1, 2012 6:58 pm
Subject: Re: REFLECTOR: NextGen NAV

Hi Bill,
I posted about this in the past, it's probably in the archive: but to summarize I was making a leg from KDVT (Phoenix area) to my home in KBBD in central Texas in N34XL when I lost GPS halfway across southern New Mexico eastbound and had to dead reckon to beyond ELP, about 45 mins. I had just bought N34XL and was relocating it to my home, it only has GPS in the panel and I had a backup Nav  for my IPad, both went down. On with ELP APP I heard the controllers calling vectors for the SKED Airliners, and with SWAL B37 drivers responding to controllers that they had lost primary nav. As well I heard the controllers working F-18's, and finally after quite a while flying dead reckoning (sandwiched in a corridor inside Restricted Airspace) a controller on APP announced that GPS jamming was occurring in the area, with no known time at which it would stop. I was just south of White Sands NM when I lost GPS initially. I think I drove out of the jamming area and regained GPS about 35 NM east of ELP, probably 145nm without GPS.  Apparently US Military was conducting drills over White Sands and was jamming GPS. I'm glad is was CAVU that day. 
After this event, I reviewed this with a few B37 drivers at SWAL I know, and they said that if close to restricted airspace in certain parts of the country, GPS jamming is common. And the jamming spills out way beyond the perimeter of the Restricted airspace. So the more active military OPS and Restricted airspace you have in your local area the better chance you have of losing your GPS in flight.
That's it in a nutshell. 

Mark

On Sat, Dec 1, 2012 at 4:50 PM, Stockman, Bill <bill.stockman at daytonaero.com> wrote:

Mark

I'm late to the discussion.   How did you know you were actually being jammed?
________________________________________
From: reflector-bounces at tvbf.org [reflector-bounces at tvbf.org] On Behalf Of Mark Magee [edjonesbrady at gmail.com]
Sent: Saturday, December 01, 2012 3:20 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: NextGen NAV

On Dec 1, 2012, at 12:18 PM, James Lotspeich <jlotspeich34 at gmail.com> wrote:

> On the flip side, GPS jamming is not exactly a common problem.

True. Yet the fact it is so easily (and inexpensively) jammed is concerning. The first time you encounter your own personal session of being GPS jammed in-flight while PIC, behind  a panel with no VOR, NDB, ADF installed it greatly changes your perspective. Having my GPS jammed for almost 45 mins in-flight has turned me into an activist on this issue.

Mark B. Magee
Sent from IPhone 4S

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