hawkeye-08 wrote:
If I am running my GPS (following route, not just displaying map), it logs my route, speed, elevation and I can play that back.
How accurate is GPS? I know for a FACT that the GPS in my cruiser (which is a VERY expensive unit and one of the most accurate we could buy at the time) is accurate within something like 80 feet. Being off by 80 feet at any point in time could seriously skew the numbers. As a result, speeds measured by GPS units are not certified in courts of Maryland. Might be different in your jurisdiction, but it is no where near exact enough to be entered into evidence as fact in Maryland.