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Hahaha nice idea! Do you have one?

Maybe he means to just use your GPS to tell you your speed.

One thing I've done is figured out what my speedo reads for certain common speed limits...
25MPH ~ 23MPH on the speedo
35MPH ~ 32MPH on the speedo
45MPH ~ 41MPH on the speedo
55MPH ~ 50MPH on the speedo
65MPH ~ 59MPH on the speedo
70MPH ~ 63MPH on the speedo

etc. <img src="/forums/images/graemlins/kewl.gif" alt="" />


Oh no, I mean an actual GPS speedo. accurate no matter what, well unless your deep underground.... <img src="/forums/images/graemlins/smile.gif" alt="" />