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[TheBoy]

In the Elite (non-calibrated), indicated 70mph is 65mph satnav
In the MV6 (calibrated), indicated 70mph is 70mph satnav

Wouldn't get too hung up on thinking the satnavs are accurate, though in your particular case, at the time you tested, seems reasonably accurate

[VXL V6]

If you use the Tech II calibration check for the speedo it should read +3Mph above actual across the whole range IIRC.

[vauxmad]

even calibrated pieces of equipment have a tollerance that they can opeprate within, although calibrated equipments tollerance is very much smaller than an uncalibrated item!

same for everything including speedo's, nothing will be exactly 100% accurate there will be a small margin but on things like speedo's it will be smaller than read and then transfered as usable info to the driver.

[Martin_1962]

Can you remove the overread with Tech2?

[tyreburner]

I would say they would be right on the money - I got stopped once and question the accuracy and was shown a report which stated the speedo was tested for accuracy that very morning  

Was always under the impression every day, but reading the next post once a week seems more realistic, all i know is plod dont like it when you ask to see the speedo caliberation paperwork, especially if they aint got any  8-)
That might be why they checked my spare, handbrake, seatbelts? and made sure the battery was secure and i had screen wash in the  bottle and it worked  

[tyreburner]

In the Elite (non-calibrated), indicated 70mph is 65mph satnav
In the MV6 (calibrated), indicated 70mph is 70mph satnav

Wouldn't get too hung up on thinking the satnavs are accurate, though in your particular case, at the time you tested, seems reasonably accurate

Must admit the sat nav tends to agree within 1mph of most of the caliberated coaches i drive  

[VXL V6]

Can you remove the overread with Tech2?

Speedo's should over-read by a set margin, far more preferable than under-reading from a legal point of view.

[Mr Skrunts]

I found it interesting in my Carlton Diplt.  Set the cruise on the motorway at 70.  Reset the fuel computer ro - - - both the fuel computer and the Tomtom in the car were showing 66mph (average speed on FC)  Rest it 4 or 5 times and was on faily level motorway.  So trusted 2 of the 3 to be correct.

Also handy to know exactly what the speedo reads at 70mph

[hotel21]

I would say they would be right on the money - I got stopped once and question the accuracy and was shown a report which stated the speedo was tested for accuracy that very morning  

Was always under the impression every day, but reading the next post once a week seems more realistic, all i know is plod dont like it when you ask to see the speedo caliberation paperwork, especially if they aint got any  8-)
That might be why they checked my spare, handbrake, seatbelts? and made sure the battery was secure and i had screen wash in the  bottle and it worked  

Dunno about down south but, up here, all thats recorded is a notebook entry to say the daily checks were done and there is no requirement to show that entry to any offender.  

If a case subsequently goes to trial then a Certificate of Accuracy for the relevant device for the day is prepared and submitted by the Officers dealing.  The notebook entry is evidence to verify.  That entry (or its lack) would then be a legal argument at trial.....