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Old 19 May 2009, 10:14   #1
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GPS Failures due soon?

I just read on the YBW site that the US Airforce forgot to send up replacement satellites, anyone heard similar?
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Old 19 May 2009, 10:24   #2
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There is a bit more info here:

http://www.pocketgpsworld.com/GPS-Co...ouble-6997.php

Cheers

Chris
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Old 19 May 2009, 10:24   #3
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Cant comment on whether the US forgot to send up replacements, but certainly NO threat to GPS.

As the vast majority of both civil and military flights are using this as there primary navigation tool now, I cannot see this being allowed to happen. Would make for very interesting times trying to keep them apart! Mind you it would make the job more interesting whilst the traffic has dropped so much .........
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Old 19 May 2009, 10:58   #4
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This story seems to pop up every few years - but as 250 says as the majority of military & civial flights ( let alone marine & land based users ) rely on this I dont think it will ever happen. The global impact of GPS dropping away is just not viable. The military will see to that - even then if we go back to the days of selective availablity & deliberate errors on the system to stop the civil users there are ways around it now.
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Old 21 May 2009, 14:04   #5
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Will GPS stop working next year?

Probably not, but if you listen to some stories it's all about to come to an end. If you fancy a longish and not particularly interesting read, this is the study that has the detail http://www.gao.gov/new.items/d09325.pdf

If you want a more readable version - try this http://news.sky.com/skynews/Home/Tec...y_Office_Warns
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Old 21 May 2009, 14:19   #6
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Isn't navigation by traditional methods still a critical part of Navy/forces training ?
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Old 21 May 2009, 15:30   #7
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it should not make any difference to us seafarers , we can all fall back on to the basics paper charts and compasses ,dividers ,carn,t we .......lol.
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Old 21 May 2009, 15:51   #8
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Some of us can Mart.
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Old 21 May 2009, 15:53   #9
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Quote:
Originally Posted by 250kts View Post
Cant comment on whether the US forgot to send up replacements, but certainly NO threat to GPS.

As the vast majority of both civil and military flights are using this as there primary navigation tool now, I cannot see this being allowed to happen. Would make for very interesting times trying to keep them apart! Mind you it would make the job more interesting whilst the traffic has dropped so much .........
As an aside, whilst GPS may play a part in aircraft navigation systems, it doesn't have role in keeping them apart - this is done by ATC using primary and secondary radars, Mode S and various other little gizmos. It doesn't rely at all on the aircraft being able to tell ATC where it is, ATC already knows that, especially as GPS is two dimensional.
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Old 21 May 2009, 16:04   #10
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especially as GPS is two dimensional.
are you sure? most gps will give altitude readings - and I think they all need to take it into account to accurately calculate long/lat.
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