Quote:
Originally Posted by slochild
It's not really what it was designed for, but I'm using Garmin Mobile XT as my turn by turn navigation GPS and noticed that it has a speedo built into it (It displays the posted speed limit and your actual speed). I don't know how much precision you're looking for, but if you don't need anything with scientific accuracy than this might do the trick.
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+1 I actually use this as my main speedo when traveling to other states
