What is life like with your car? Let us know and win £500 in John Lewis vouchers | No thanks
Is my Road Pilot GPS system more accurate than my speedometer?
I have recently taken a subscription for Road Pilot, which warns one of speed cameras and shows my speed on my iPhone (which is fixed onto my car windscreen). I notice that typically my car speedometer shows say 73/74mph, while the Road Pilot shows 68/69mph. My query is, which is correct in the eyes of the law/police?
Asked on 28 December 2013 by OS, Southport
Answered by
Honest John
If it's GPS, on a flat road under a reasonably clear sky your Road Pilot will generally be accurate and your speedo will generally over-read. ACPO recently released new guidelines on speeding penalties. They are at: honestjohn.co.uk/faq/speeding-penalties/
Similar questions
Google maps shows the speed limit of the road you are on and your current speed. I’ve noticed that this is 4mph less than that displayed on my speedometer. It’s the same in my wife’s car and a friend has...
Under the heading 'Purring along' you seem to advocate driving at a steady 75mph on a motorway. I am under the impression from the Highway Code that the maximum speed on motorways and dual carriageways...
When the cruise control on my Volvo XC70 is set at 60mph the TomTom says I am doing 58/59. When setting the cruise control to 61mph TomTom says I am doing 60. Which is likely to be more accurate, please?...
Elsewhere on 
.jpg)
