Any options to get the 'Speed' displayed more accurte


Joined
Jun 9, 2008
Messages
50
TomTom Model(s)
TomTom Go 720
I noticed that the speed displayed in my TT720 is off by 4-5mph :mad: when I am in the speed range of 45-75mph. Is there any option to give an offset to the Speed so that the speed display is more accurate in this range.
I think the issue is because of the error in the conversion from the GPS speed(which I think is in knots) to mph. So I would think that the error would vary with the speed range.
If I can atlest have the offset helping in the 45-75mph range I would be happy. I know that some GPS units allow a general offset.
Any suggestons, tips would be greatly appreciated.
 
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Joined
Dec 18, 2007
Messages
887
Location
South FL
TomTom Model(s)
TomTom XL-335TM; Map 935.5811
Actually, the TomTom is most correct and our car's speed reads low. Something about the manufacturer's tolerance for speedometers can be + 0% and - 10%, so most cars read low. Since GPS's calculate speed using satellite triangulation, they are most accurate (as long as you're traveling on a level highway). When my car's speedo reads 74, my TomTom indicates 70.

For a long and interesting discussion on this, see this thread at Pocket GPS World:
http://www.pocketgpsworld.com/modules.php?name=Forums&file=viewtopic&p=372216#372216

and for one of the better posts in this thread:
http://www.pocketgpsworld.com/modules.php?name=Forums&file=viewtopic&p=372644#372644

Hope this helps.
 
Last edited:
Joined
Dec 31, 2007
Messages
185
Location
South Alabama
TomTom Model(s)
Go 720 with 920 POI's
How do you know the GPS speed is off? Every GPS I've ever heard about is very accurate speed wise. To something like 1/10 of a mile per hour when traveling at a steady pace. If you're using your autos speedometer to gauge it they're notoriously wrong!
 
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Joined
Jun 9, 2008
Messages
50
TomTom Model(s)
TomTom Go 720
Thanks Rick F and Bama.

I was comparing the speed with the speedo of my car. I did not consider the speedometer tolerance and was ignorant about the numerous factors governing its accuracy.
Thanks for the link, Rick, and again appreciate the inputs from you guys.
 

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