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[Entwood]

A car speedo is required to be accurate to within 10%.  Reaqlity is that it will over read as otherwise, the speedo could give a readout whereby it said you were doing 30 and in reality, you were doing 33 outside your local school.  Given the propensity of the Talivans, the least you could expect is a warning letter, if not a nicking, given current enforcement measures/campaigns.....   

So, speedo will over estimate your speed - you want to see the magic fast numbers anyway, as per the published figures, sooner rather than later anyway??   

As said by others, satnavs use a geopositioning system that works in 3 axes and thus is greatly affected by height.  For height, read road inclines and undulations and thus, it assumes an arrow straight path from A to B between display indications.

This introduces a margin of error which may or may not be less than the 10% speedo reading.

In reality, as far as I know, those who are subject to legal proceedings who give satnav speeds as a potential defence are in the situation where its interpretation is subject to legal presentation.

In other words, whomsoever talketh the most 'dangle berries' to influence the Judge, may win....   



or not........   

In 15 months of court work I never saw a case where the Magistrates or District Judge took a "sat nav" plea .... The calibrated equipment was always believed in preference ...  even when it was just the speedo reading being quoted.

One bench I remember actually asking the accused if he could prove that tom Tom actually tested or calibrated the equipment. He couldn't and got 6 points and a hefty fine....   

[Mr Skrunts]

My satnav says the car is travelling at a slightly different speed to the speedo...if the satnav is correct then the the speedo is overreading by about 5%.

Is the satnav likely to be the more accurate?? If so will having bigger or smaller wheels make the speedo more accurate and what size would roughly speaking do the job??

Would trust sat nav to be more accurate. GPS initially has come from military souces..My speedometer is about 2/3 mph over at about 30mph on sat nav and the radar operated signs. The error increases with speed to about 6mph at 70. i.e 76 on speedometer is 70. You could try sitting at 60mph and timing between mileposts. It should be one minute.

Allways wondered why I seemed to be travelling slower than everyone else on a motorway, those pesky beemer a smirk cars speedo's must be way out then.

[dbr]

My satnav says the car is travelling at a slightly different speed to the speedo...if the satnav is correct then the the speedo is overreading by about 5%.

Is the satnav likely to be the more accurate?? If so will having bigger or smaller wheels make the speedo more accurate and what size would roughly speaking do the job??

Would trust sat nav to be more accurate. GPS initially has come from military souces..My speedometer is about 2/3 mph over at about 30mph on sat nav and the radar operated signs. The error increases with speed to about 6mph at 70. i.e 76 on speedometer is 70. You could try sitting at 60mph and timing between mileposts. It should be one minute.

Allways wondered why I seemed to be travelling slower than everyone else on a motorway, those pesky beemer a smirk cars speedo's must be way out then.

I just laughed at this one...and then thought ....   Mercedes Vans in calibrated white. they have got to have THEEE most accurate on the planet!!

[Kevin Wood]

I just laughed at this one...and then thought ....   Mercedes Vans in calibrated white. they have got to have THEEE most accurate on the planet!!

They're called Sphincters, aren't they. Certainly drive like 'em.

Kevin

[dbr]

I just laughed at this one...and then thought ....   Mercedes Vans in calibrated white. they have got to have THEEE most accurate on the planet!!

They're called Sphincters, aren't they. Certainly drive like 'em.

Kevin

Love it Kevin.........