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I have used the speedview. It's pretty good. Just a couple mph off from tomtom. But the quarter mile time didn't seem right.0-60 was very close. Used this on the airplane yesterday and it held satalite signal to 462.2 mph the lost signal.
Since you mentioned it, I picked up the Dynomaster app this morning. Gave it a test run in the work truck today. I'll have to test it outside Center City. GPS is notoriously fluky there because of the buildings.
If / Once it loses GPS accuracy, the numbers are irrevocably skewed.
i have the htc evo... if these apps prove to be functional i would definately be interested in them. i just feel like they are not entirely accurate lol maybe a friend with a stopwatch would be better