Tom Tom Navigator 6

[kcphil]

I have a t-mobile mda vario, i have tom tom running but my speedo on tom tom and the sdeepo on the dash do not read the same, the dash will read eg, 30mph but tom tom will read 23mph, how can it be 7 mph out???

which do i go with, the car is 12 years old could the car speedo be wrong???

[jjkim5]

Well, Most of cars' (new or old) dashboard speedometers are not accurate. That's because the car system calculates speed by rotation of wheels. But There are many of factors to consider such as tires condition , tires size and road condition which cause speed of a car. And also even if all readings are correct, there might be slight error on displaying speed on the dashboard (if it's not a digital speedometer)

But GPS calcurates the speed of the car by coord. of a car at the point A to B divides by the time it takes (simple algebra). So it is very accurate.

[GldRush98]

Simply this:

Your dash is wrong.
GPS is correct. If anything, GPS might be off by 1 or 2 mph, but it's still going to be much more accurate then your dashboard.
Vehicle speedometers are notoriously inaccurate.

[demontefixo]

I have a t-mobile mda vario, i have tom tom running but my speedo on tom tom and the sdeepo on the dash do not read the same, the dash will read eg, 30mph but tom tom will read 23mph, how can it be 7 mph out???

which do i go with, the car is 12 years old could the car speedo be wrong???That is why we keep honking at you...you are holding up traffic!!

:D

--M

[furian]

hehehehehe

indeed freaking sunday driver (A)

now i know why i ended up coming to late to work (A)