I drive a SsangYong Musso, and the speedometer consistently reads a few miles per hour above my satnav. I have always believed that the satnav would be the most accurate and reliable, but I recently ...

Thanks to GPS satellites, ClassicInstruments' Sky Drive can turn your speedometer into the world's most accurate speedometer possible by updating 10 times per second! Plus, it can be a GPS enabled ...

Q: What would be more accurate, my vehicles speedometer or a GPS I have on my dashboard? A: They both can be accurate and inaccurate. Speedometer: Aftermarket modifications, such as different tire and ...