Here's how car speedometers calculate how fast your vehicle is going. And here's why they may not always be accurate.

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 ...

Apple recently revealed a new version of its CarPlay system for vehicles, which include gauges like speedometers. But even Apple, the company that cast aside tradition when it reinvented phones, music ...

Plus, it can be a GPS enabled security system set off if the vehicle move more than a 65 ft from where you left it! We love that idea; security is too often forgotten on hot rod and classics. With the ...