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      05-07-2013, 11:29 PM   #33
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Drives: M3 (E90) & Shelby GT350R
Join Date: Feb 2012
Location: San Francisco

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This was see it in the upper right corner...bell goes off at 300 and gps speed is 282.

Originally Posted by swamp2 View Post
Good information. I was under the impression that speedo error was just a fixed percentage. I have personally verified 3-4$ at speeds below 100 mph in my car, GPS vs. indicated. However, someone else also posted that they thought the percentage rose at higher speeds. I would love to see that information if you can find it.

There is certainly no reason BMW couldn't program the speeds to do anything they want. My idea that the correction is a fixed % is, I guess, a bit outdated and sort of an "analog"/"mechanical" way of thinking.