Quote:
Originally Posted by reformed
What type of GPS is it? if it is a portable one, they tend not to be all that accurate, if it is an in-dash GPS with the speed sense hooked up, then they are relatively accurate.
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Why would a portable GPS automatically be less accurate? The math involved in GPS triangulation isn't all that complicated and in all likelihood, the GPS modules in in-dash variants (technically, mobile
) are similar if not exactly the same.
That being said... And answering the OP. I had three GPS's running in my car at one point. One was over cell, one was for navigation used for geocaching (didn't have road maps etc.) and the third was a Magellan 3xxx. Everything was dead to nuts equal and matched with the SG
My speedometer, on the other hand, is 5mph slow at 70mph
