How accurate is the speed indicator on a Tom-Tom G910?

Question

How accurate is the speed indicator on a Tom-Tom G910?

Answer 1

Very good, you'll probably find that it reads about 2 miles per hour less than your speedo, as speedo's have a built in safety (probably)

Answer 2

Accurate. NB it measures the average over the last 10-20 seconds, assumes you are travelling in a straight line, and is subject to the +- 5 metres position accuracy, which is pretty consistent over a short time

Answer 3

In a word... Very

Much more accurate that your speedometer..

Answer 4

very good

all sat navs have good speed indicators, if you have lots of sats links over 4 is good 9 is best