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Speedometer vs TomTom

This is a discussion on Speedometer vs TomTom within the Maintenance & Performance forums, part of the General Motoring Discussions category; Originally Posted by ScoobyChris It tells the time too? Chris Nah, it's got Snake built-in! Don't forget, the 'accuracy' of ...


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Old 06-03-2008, 17:16   #26
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Re: Speedometre VS TomTom

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Originally Posted by ScoobyChris View Post
It tells the time too?

Chris
Nah, it's got Snake built-in!

Don't forget, the 'accuracy' of GPS systems is 'improved' by sticking you firmly on marked road. One of the new sections of the M60 includes sliproads either side of the main carriageway that run for a good couple of miles between two junctions. If you were to stay on the motorway when the route wanted you to go onto the sliproad, the GPS wouldn't twig you were a good 20 or 30 metres off-course...
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Old 06-03-2008, 18:25   #27
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Re: Speedometre VS TomTom

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Originally Posted by ScoobyChris View Post
It tells the time too?

Chris
Yup it has a Breitling watch Moulded into it which accounts for the other £29900
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Old 06-03-2008, 19:00   #28
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Re: Speedometre VS TomTom

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Originally Posted by KenONeill View Post
What is the exact wording of that data sheet?
It's on the second page of the data sheet linked in the post above yours, and specifies accuracy rather than precision.

http://www.sirf.com/products/GSC3LPProductInsert.pdf
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Old 06-03-2008, 20:48   #29
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Re: Speedometer vs TomTom

Most cars are set to around 5% above the limit, you also need to take into concideration tyre pressure and tyre wear too. my speedo is around 1-2% thanks to it being calibrated before it was fitted.
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Old 07-03-2008, 09:30   #30
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Re: Speedometre VS TomTom

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Originally Posted by TKW View Post
It's on the second page of the data sheet linked in the post above yours, and specifies accuracy rather than precision.

http://www.sirf.com/products/GSC3LPProductInsert.pdf
Cheers for that. The quoted accuracy figures are taken at 130dB gain, and my experience suggests you hardly ever get that good a gain level.

At a more typical 140dB gain, you can take 2 orders of magnitude off that with a 5 satellite lock, and another 1 for each satellite less you've got locked.
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Old 07-03-2008, 09:53   #31
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Re: Speedometre VS TomTom

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Yup it has a Breitling watch Moulded into it which accounts for the other £29900
Facetious comments aside, during my time as a Scaley STAB, I was surprised at how far behind the comms kit that we and the ARABs used was compared to what was available commercially. The top-banana comms equipment at the time was ATCIS (sp?), which appears to be pretty similar to the ATacCs that they now use. ATCIS looked like a cross between a Speak 'n' Spell and a cash register, with something like a 10" monochrome screen that allowed various DOS-based applications to be accessed from in the field. At the time, my digs had a payphone, so I accessed the internet on my laptop using the IR modem in my mobile. This gave me far more functionality than ATCIS ever did, and while I'm sure that my laptop and mobile probably wouldn't have the same battery life, and neither would they survive being dropped off the back of a Land Rover, I couldn't see any other real benefits that it had over my stuff. Indeed, I had quite some fun passing the time sat under the cam net surfing the net (at a mighty 9.6kbps!) while we were waiting for the other nodes on the net to come up...

Then again, I remember clearing out the Q-Stores and finding a spare door handle for the back door of one of out radio relay wagons. It wasn't one that turned or anything, just attached at top and bottom to allow you to pull the door closed. The invoice for it was still attached: £23! For a bent piece of metal with holes either end! Defence contracting is the business to be in - once you win the tender, you can charge whatever the Hell you want! Then again, you'll probably find that one of the Chiefs of Staff was the fag of the Director of the contractor, so there's a whole lot of funny handshakes going on. Little wonder most of our personal kit was bought privately... Tens of thousands of pounds overcharged for a 'soldier-proofed' bit of otherwise obsolete electronic equipment, and they can't spare a few hundred to provide body armour for everyone or air filters for Challengers to allow them to run in the desert...

And don't even get me started on the Typhoon. They've not even brought it into service properly yet (8 in total based at Coningsby after how long?), and it's already miles behind the Yanks' and Russians' latest offerings. Not that the JSF project has been any better in terms of lateness or cost, but at least it's state of the art...

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Old 07-03-2008, 10:13   #32
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Re: Speedometer vs TomTom

If you treat Typhoon as a productionised version of the BAe ATP demonstrator, it is about 10 years older than the F-22.

I make no comment about "time to service".
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Old 07-03-2008, 10:33   #33
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Re: Speedometer vs TomTom

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If you treat Typhoon as a productionised version of the BAe ATP demonstrator, it is about 10 years older than the F-22.

I make no comment about "time to service".
Can't argue with any of that, I suppose. What bugs me about the Typhoon is that its main advantages over the Tornado are supposedly the avionics (fair enough, the Tornado was born in the 70s, and look at how successful the Nimrod refit programme's been! ), and the manoeuvrability. I wonder when the last 'proper' dogfight involving and RAF aircraft actually was. Air combat strategy hasn't changed AFAIK since the 60s: have missiles with longer ranges than the enemy, fly really fast until the missiles lock onto the enemy aircraft, fire your missiles than leg it really, really, really fast! At a distance of 30 or 40 nm, I really don't see the necessity of being able to turn on a sixpence - I doubt you could even see the other aircraft. BAe must have been laughing behind their hands when they sold the whole manouvrability thing...

To make things worse, a quick go on Wikipedia to look at the history of the Typhoon shows that the MRCA project kicked off only four or five years before ECA - and the Tornado's been in service nearly 25 years!!!

I really am in the wrong business...
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Old 07-03-2008, 10:40   #34
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Re: Speedometer vs TomTom

Probably Korean War - Wikipedia, the free encyclopedia for the last RAF "guns vs guns" dogfights, and the 1973 Israel vs neighbours unpleasantness for the last turning battles.
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Old 07-03-2008, 19:26   #35
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Re: Speedometer vs TomTom

ap0gee

We have far better kit now and you would be highly surprised at the Systems we have these days.

But your right tho people defo bump the price up for kit to the army. Hence they are starting to local purchase things straight off the shelf these days.

I remember an alignment system we used to use for one of the weapon sights. An ordinary cross head screwdriver (albeit with a serial no. and crowsfoot on) was valued at £538 for a bleedin screwdriver.

Someone soon cottoned on you could get 538 from B&Q for that. Thankfully the system has been replaced for a more expensive computerised version that doesnt work properly
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Old 10-03-2008, 09:41   #36
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Re: Speedometer vs TomTom

Anyway, we all know there's only one way to settle this:-

FIGHT!!!
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Old 10-03-2008, 10:13   #37
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Re: Speedometer vs TomTom

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Anyway, we all know there's only one way to settle this:-

FIGHT!!!
Maybe a kindly traffic policeman could help?
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Old 13-03-2008, 21:37   #38
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Re: Speedometer vs TomTom

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Originally Posted by KenONeill View Post
Probably Korean War - Wikipedia, the free encyclopedia for the last RAF "guns vs guns" dogfights, and the 1973 Israel vs neighbours unpleasantness for the last turning battles.


The russians still have the best production aircraft for dogfights. The Mig 29 Fulcrum/SU-27 Flanker (basically the same thing) can out turn just about everything out there!

And they have the only ejector seat that works inverted - hence why the yanks are trying it out.
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Old 14-03-2008, 09:29   #39
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Re: Speedometer vs TomTom

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The russians still have the best production aircraft for dogfights. The Mig 29 Fulcrum/SU-27 Flanker (basically the same thing) can out turn just about everything out there!

And they have the only ejector seat that works inverted - hence why the yanks are trying it out.
Would you like to make any other specious claims, say that the F/A-18 and F-22 are basically the same?

That said, I agree that the Tumanski has a remarkable high alpha performance, and that the K-36 is the best ejector seat in the World.
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Old 14-03-2008, 11:08   #40
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Re: Speedometer vs TomTom

Whats an inverted ejector seat?
One that fires down like on the L101 Starfighter of the late 60s
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Old 14-03-2008, 11:28   #41
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Re: Speedometer vs TomTom

Aplogies for reverting to post topic, but the digital SPEED reading in my Octavia is identical to the GPS speed calculation on my Road Angel.

Was really surprised by this, as it means that cars can be manufactured to display EXACT speed, but as mentioned the needle indicator is deliberately over estimating.

Pressumably for both yours and their protection so you don't speed and they don't get sued for speeding and to cover most errors from different tyre sizes, wearing limits, inflation pressures etc etc
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Old 14-03-2008, 11:34   #42
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Re: Speedometer vs TomTom

Don't forget, plod use calibrated speedos, so it must be possible. Of course, the speed is taken from the transmission, so there will always be a degree of variation as the tyres wear, whereas a GPS speed reading won't be affected by this (although there are other accuracy issues such as the number of satellites being triangulated etc...)
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Old 14-03-2008, 11:50   #43
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Re: Speedometer vs TomTom

In this case, one that fires upwards in local aircraft axes, but turns itself to put the pilot above the seat in the gravity field between leaving the aircraft and the pilot parachute deployment.

If you remember those 2 MIG 29s colliding at the Farnboro Show a few years back, the K-36's performance played a part in saving both pilots' lives.
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