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Old 27-01-2011, 11:24   #16
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The military can and does jam GPS reception to a local area all of the time.

Also, be aware that newer cars, police, fire, 911, and truckers depend on GPS.
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Old 27-01-2011, 11:38   #17
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Maybe they're using an airborne jammer? The map shows the center of the affected area to be in the "Warning Area" of the coastal Air Identification Defense Zone (ADIZ), where U.S. aircraft commonly train. Makes sense to conduct the tests offshore and not over the mainland.
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Old 27-01-2011, 11:43   #18
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I strongly suspect that this is a bunch of horse pucky! First, the satellites can't be turned off for one area. If one or two were to be turned off for some maintenance or other test then you'd still have a bunch and would get fairly good positioning.
Here is the direct information from a screen shot from the USCG notice.

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Old 27-01-2011, 17:28   #19
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This question this post presents (navigation without GPS?) seems like a fair question and so far the responses are more about denial that this could happen. Hmmmm.
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Old 27-01-2011, 17:35   #20
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they do not include ON / OFF switches on space packages... they will never turn them off, and if they could, there would be the chance they wouldnt start up...

I am sure they can block or jam whatever whenever..

they are pikcing hte worst time.. i will depend on gps on my journey to florida... this will effing hurt if i cant get around...

andyes, i can rad a map and will get one...

and figure it out just like the old days.
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Old 27-01-2011, 18:20   #21
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The "on/off" switch is at the ground stations, in the same way they can alter satellite orbits from the ground- send a software command. Just like remote desktop.

However, in this situation the system isn't switching off, per se. This is a jamming exercise of some kind. Despite claims to the contrary, GPS signals are low power, & are relatively easy to jam, even unintentionally.

GPS Spoofing Countermeasures

GPS blockers and GPS jammer with the cheapest prices in Jammer-Store.com - Jammer-Store
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Old 27-01-2011, 18:30   #22
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Where is Loran C when you need it?
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Old 27-01-2011, 18:43   #23
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In addition to the reasoning question, how are they shutting off GPS in Florida and not Georgia or Idaho or ...?
Basically the military eather jammes all signals and does not replace them.Or worse.They replace them with false signals.Go try to use a sextant in a war zone{Iraq}.And be consistently 20+ miles off.There is a reason we are called the TECK army.
And a reason you need to have paper charts and the knowledge to use them.
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Old 27-01-2011, 18:49   #24
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they do not include ON / OFF switches on space packages... they will never turn them off, and if they could, there would be the chance they wouldnt start up...

I am sure they can block or jam whatever whenever..

they are pikcing hte worst time.. i will depend on gps on my journey to florida... this will effing hurt if i cant get around...

andyes, i can rad a map and will get one...

and figure it out just like the old days.
My first question is WHO ARE THEY?I hear the term THEY alot.
And if you seriously think THEY can not turn off the toys we paid for your living in a world you realy need to share.Any spare meds?Why do you state that THEY will never turn them off?THEY turn off systems in{2 examples} the space station and the Hubble all the time.
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Old 27-01-2011, 19:04   #25
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Basically the military eather jammes all signals and does not replace them.Or worse.They replace them with false signals.Go try to use a sextant in a war zone{Iraq}.And be consistently 20+ miles off.There is a reason we are called the TECK army.
And a reason you need to have paper charts and the knowledge to use them.
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WOW! The army (or whoever) is like some biblical figure -- can make the sun stand still??? Don't know what you think, but I REALLY doubt that they or anyone else can do something to make celestial navigation "20+ miles off".

Hogwash.

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Old 27-01-2011, 19:58   #26
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Well the new Congressional mandated Positive Train Control (PTC) system uses GPS for train positioning. None of these systems are up and running yet but the first contracts have been let and all Class 1 and Passenger Commuter lines are to be equipped by 2015. They don't use GPS to know what track they are on, and they have a back up dead reckoning system using wheel counters. Still, GPS is getting to be relied upon pretty heavily. Others can probably attest to its use in aviation.

One would think that its continued operation, unimpeded, would be a high priority.
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Old 27-01-2011, 20:12   #27
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in this case, NASA or the companies that own the respective satelites..

and communicating with satelites and giving order/commands to change orbitz or to destabailize the orbit is not turning them off..

thier computers dont have on off switches or commands.. period... there is a risk it wont come back on, and that would be a bad thing... it goes up,it goes on, it owrkds or it dont... but it will never be commanded to 'reboot like we do here on our computers...

the thought of including a switch or command that turns it off would never be tested..

hey, lets see if it will come back on? wait, wait, wait, wait, wait..


did it work? i dont know.. Im still waiting... dont look good, wait. wait..

now, they can 'reboot' or go thru the start up sequence, but that is not turning it off...
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Old 27-01-2011, 20:25   #28
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Where is Loran C when you need it?
Hopefully someone can get the ball rolling on eLORAN again?
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Old 27-01-2011, 20:39   #29
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I think the main question that we should ask, is why the need to jam the signal for a brief period in such a wide area off the coast of Florida?

It's obviously to test something. What?

My guess is that it is to test the use of a different GPS frequency for the government, in case some bad folks decide to get cute and jam the existing frequency.

The GPS system was put in place for the use of the US Government. Not for we sillyass boat owners.
Besides you can always use the GPS system developed in Russia.
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Old 27-01-2011, 21:31   #30
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This is from the GPS website.
The Global Positioning System (GPS) is a satellite-based navigation system made up of a network of 24 satellites placed into orbit by the U.S. Department of Defense. GPS was originally intended for military applications, but in the 1980s, the government made the system available for civilian use. GPS works in any weather conditions, anywhere in the world, 24 hours a day. There are no subscription fees or setup charges to use GPS.
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