speed display

Joined
May 14, 2010
Messages
28
Location
NC USA
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TomTom One 125
I didn't realize that there was a speed display on these units. Are they pretty accurate with this feature. However, while it is a nice feature mine is off by 5 miles an hour according to my speedometer. Does this happen a lot with other units that anyone else has heard of. Sorry for all the questions.....but a novice to the GPS scene.
 
The GPS will show the accurate speed. Your speedomter is not accurate and tends to overstate the speed you are going.
 
I didn't realize that there was a speed display on these units. Are they pretty accurate with this feature. However, while it is a nice feature mine is off by 5 miles an hour according to my speedometer. Does this happen a lot with other units that anyone else has heard of. Sorry for all the questions.....but a novice to the GPS scene.

Just remember that the gps speed display is directly the measure of distance and time while the speedometer is using gears and other mechanical means to determine speed. Your speedometer can be off by few percentage points just by changing your tires.
 
Thanks guys...that's another visit to my mechanic. I'll have it checked out and while I'm at it I have the wifes van checked out as well. In your guys opinions, what would be more accurate the GPS or vehicle speedometer.
 
I told you in my previous post and it is not opinion, it is fact! The gps is the accurate one.
 
...that's another visit to my mechanic. I'll have it checked out and while I'm at it I have the wifes van checked out as well..
Don't bother to wast money.
On older cars there is a mechanical speedo cable take off via a small gear box and that ration can be changed at will. On newer cars they use an electronic rotation counter. Either of the above is tied in (for the sake of explanation) tot he rotation of the drive shaft.

If you buy a new car, drive exactly at the speed limit per your speedo and get a get a speeding ticket from your friendly police constable you just might sue the manufacturer/car dealer.
To err on the side of caution your actual speed will be somewhat less then what the speedometer displays.
Now, after driving a month your tires are slightly under inflated. Since the distance traveled is diameter times circumference you will be driving less distance per revolution of the drive shaft.

Now, to come back to the GPS, it does not know anything about your tires it just measure how fat you actually traveled in what length of time.

bassfisher6522 said:
I didn't realize that there was a speed display on these units. Are they pretty accurate with this feature. However, while it is a nice feature mine is off by 5 miles an hour according to my speedometer.
You will now see that it is the other way around, the unit isn't off by 5 miles, the speedometer is.

Just for info, while true speed is 100 km/h, my Taurus displays 102 km/h and my wife's Freestar displays 107 km/h .
 

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