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27-01-2011, 10:24
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#16
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Registered User
Join Date: May 2009
Location: Vancouver, Wash.
Boat: no longer on my Cabo Rico 38 Sanderling
Posts: 1,810
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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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27-01-2011, 10:38
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#17
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Registered User
Join Date: Apr 2008
Location: Brooklin, Maine U.S.A
Boat: Allures 44
Posts: 734
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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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27-01-2011, 10:43
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#18
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Registered User
Join Date: Jul 2010
Location: Florida/Alberta
Boat: Lippincott 30
Posts: 9,904
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Quote:
Originally Posted by Bill_E
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.
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Here is the direct information from a screen shot from the USCG notice.
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27-01-2011, 16:28
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#19
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Registered User
Join Date: Feb 2009
Location: Fort Lauderdale
Boat: Downeaster 38
Posts: 57
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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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27-01-2011, 16:35
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#20
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cruiser
Join Date: Jan 2010
Posts: 1,129
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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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27-01-2011, 17:30
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#22
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Registered User
Join Date: Jun 2008
Location: Maine
Boat: Defever 41 "Bear Holiday"
Posts: 158
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Where is Loran C when you need it?
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27-01-2011, 17:43
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#23
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Registered User
Join Date: Jan 2011
Location: Fl
Boat: 73 pearson 35
Posts: 142
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Quote:
Originally Posted by micheck
In addition to the reasoning question, how are they shutting off GPS in Florida and not Georgia or Idaho or ...?
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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.
My Knowledge
Mark
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27-01-2011, 17:49
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#24
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Registered User
Join Date: Jan 2011
Location: Fl
Boat: 73 pearson 35
Posts: 142
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Quote:
Originally Posted by Bergovoy
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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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.
My Thoughts
Mark
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27-01-2011, 18:04
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#25
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Moderator
Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 21,134
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Quote:
Originally Posted by travler37
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.
My Knowledge
Mark
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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.
Jim
__________________
Jim and Ann s/v Insatiable II, lying Port Cygnet Tasmania once again.
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27-01-2011, 18:58
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#26
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Senior Cruiser
Join Date: Dec 2008
Location: Between Caribbean and Canada
Boat: Murray 33-Chouette & Pape Steelmaid-44-Safara-both steel cutters
Posts: 8,492
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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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27-01-2011, 19:12
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#27
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cruiser
Join Date: Jan 2010
Posts: 1,129
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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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27-01-2011, 19:25
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#28
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Registered User
Join Date: Jun 2009
Location: Oromocto, New Brunswick
Boat: 1976 Alberg 37 Yawl hull 172
Posts: 395
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Quote:
Originally Posted by hanschristian38
Where is Loran C when you need it?
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Hopefully someone can get the ball rolling on eLORAN again?
__________________
Facts are for people who can't create their own truth. Fact.- Bucky Katt
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27-01-2011, 19:39
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#29
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Registered User
Join Date: May 2009
Location: Vancouver, Wash.
Boat: no longer on my Cabo Rico 38 Sanderling
Posts: 1,810
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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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27-01-2011, 20:31
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#30
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Registered User
Join Date: Sep 2010
Posts: 329
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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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