Quote:
Originally Posted by jcraigau
I find they also take a couple of seconds to show changes in speed.
When braking or accelerating I could notice the difference.
Very accurate when doing a constant speed.
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This is all true. I have had GPS speedos in my boats for years. They are very accurate, but they do have some lag. When doing top speed runs in my boat, I have to hold the speed for a couple seconds if I want the real number. I have wondered for a while now why they are not more popular in autos. You can change tire size, gear ratios etc... the speedo does not have to re-calibrated.