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Old 18 April 2005, 07:35   #1
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funny GPS

Ok , so here goes. In my car I have "road angel" and a GPS communicator ( brought dirt cheap in the states) - Raming -USB GPS receiver - which I used as a nav system linked to a laptop PC both in the car and on the Rib
The "road angel is GPS linked and is basically a'stored' address system for all known speed and radar traps in the Uk ( works very well!!!!!!!!!) it can also detect laser cameras... OK what happend?? - Sunday morning at 0400 hrs GMT +2 out in the car -"road angel" powers up and detects saterlites and all Ok. But the Rayming - did'nt pick up ONE saterlite and did'nt do so the whole
day.Used another portable in the house 6 hours later- no detection. This morning at 1100 hrs GMT the Rayming picks up 11 saterlites and is now Ok.
Somewone tell me what happened please, because if I had to rely on this one , I would probably end up in the mddle of the Atlantic.Are our friends across the pind turning off systems???

Jonatan
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Old 18 April 2005, 08:28   #2
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GPS can be a lot easier to "jam" than people realise - the military sometimes experiment with gps jamming but issue notice to aircraft and shipping.

http://www.computerworld.com/securit...,77702,00.html

This article mentions concerns over homemade gps jammers - not as hard to make as you would think!!!

Because GPS receivers are so sensitive to pick up signals from space a jammer of only 1 watt power can knock out a 100km radius if done from the air.

http://www.computerworld.com/securit...,77702,00.html

Also many things can block gps signals by accident - powered tv aerials are just one example.

This just goes to show why we shouldn't become TOO reliant on GPS alone!!!
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Old 18 April 2005, 08:43   #3
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Quote:
Originally Posted by eupa
The "road angel is GPS linked and is basically a'stored' address system for all known speed and radar traps in the Uk ( works very well!!!!!!!!!) it can also detect laser cameras...
Not all UK laser camera's.. As the 3 points on my licence will testify.. (Photographed from behind, on the other side of a dual carriageway as I sensibly accelerated upto the speed limit which changed from 40 to 70 half a mile ahead..) It also is too reliant, (again in the UK,), on the manufacturer's updating the static camera locations.. The roadworks on the M25 being a good example.. These camera's were being moved on an almost daily basis, but the info was only being updated once a week.. Or whenever one of Roadangel's tech guys drove around the 25 and took note of the camera's location..
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Old 18 April 2005, 12:39   #4
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thanks codprawn - as usual good info, nice to see you on the board again...but the 'road angel was sitting just besides the laptop- and both are nema 0183 compliant- but one works and one dont. - i dnt know what the power output of the raiad angel is- but would be it be greater than a usb linked transmmitter??
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Old 18 April 2005, 12:47   #5
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"These camera's were being moved on an almost daily basis, but the info was only being updated once a week.. Or whenever one of Roadangel's tech guys drove around the 25 and took note of the camera's location.."

Road angel picks up a rear camera. Mine does ( new road angel) - you are not telling me that thet did you with a camera on the other side of the road?? that.s disgusting and surely not legal??- Ok the beam is very narrow but how can they be sure it was you?? - cant you tell them to stick it somewhere ? or have I been out of the UK too long?

Jonathan
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Old 18 April 2005, 13:24   #6
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I was once told that the power of the GPS signal is comparable with a 1 watt torch bulb viewed from the moon!

This was during an aviation safety presentation on the use of GPS and we the Uk authorities (CAA) won't allow it as a primary navigation tool.

SDG
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Old 18 April 2005, 17:58   #7
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Quote:
Originally Posted by eupa
"These camera's were being moved on an almost daily basis, but the info was only being updated once a week.. Or whenever one of Roadangel's tech guys drove around the 25 and took note of the camera's location.."

Road angel picks up a rear camera. Mine does ( new road angel) - you are not telling me that thet did you with a camera on the other side of the road?? that.s disgusting and surely not legal??- Ok the beam is very narrow but how can they be sure it was you?? - cant you tell them to stick it somewhere ? or have I been out of the UK too long?

Jonathan
The thought of telling them to prove it did cross my mind, until I spoke to a couple of traffic guys.. According to them it is legal to photograph you as you drive away.. The new roadside camera's in the UK are getting more and more sophisticated.. They are using mobile one's on the M4, they can pick you out half a mile away.. Their being used to enforce the 70mph limit, with no lee-way..
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Old 18 April 2005, 18:02   #8
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You could just drive a bit slower!

BTW Hampshire Constabulary (police service?) now use a black Skoda Octavia.
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Old 18 April 2005, 18:14   #9
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BTW Hampshire Constabulary (police service?) now use a black Skoda Octavia.
What for, target practice?
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Old 19 April 2005, 00:20   #10
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Hee hee

No, they had nabbed someone with is yesterday evening on the M3. They'll probably stop you in your Japanese tractor just for making fun of them.
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