reformed -
Quote:
Originally Posted by reformed
The portable GPS units are less accurate because they don't use the speed sense signal from the vehicle in their calculations like the in-dash ones do. Combining the actual speed sense signal with the GPS triangulation, makes them more accurate.
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To me this is counter-intuitive because the point of the GPS is to get a reading that is independent of the car's on board sensors, which may be inaccurate.
I do have one caveat. When I was driving with the GPS, I left it front and center on the dashboard, wedged up against the windshield, to insure good signal strength. If I left it in a side pocket or on the floor, it wasn't accurate. My logic was that I didn't want it to lose the signal before I made a right turn, and then just have it "connect the dots (aka the hypotenuse distance of a right triangle)" when it got the signal back.
CarloSW2