Originally Posted by
pee vee
im sure the sample rate of proper timing gear is higher than tom tom!
tom tom seems to sample once a second? datron etc is far more accurate than that.
but they must all use the same gps sattellites? so would be pretty good i'd say
you're right, the sample rate of proper timing gear is higher than satnav. i would guess that tomtom is 10Hz though, even if it only updates on the screen at 1Hz. but as i said, if you are holding the speed steady over a good distance, then it will be accurate to within +/- 1mph
and yes they all use the same satellites, but some systems are more sensitive than others and have more channels so can theoretically be more accurate