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 ...

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 ...

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 ...

If you can ride a bike with no handlebars, no handlebars, no handlebars, you can do just about anything. You can take apart a remote control, and you can almost put it back together. You can listen in ...

Q:I operate two vehicles with two different aftermarket GPS systems, each gives me conflicting speed readings in relation to the vehicles' speedometers. Which is more reliable, the factory installed ...

A recent update to Google Maps has allowed motorists to see their live speed, similar to the function already offered by the navigation app Waze. If you're new to apps with a GPS speedometer, you may ...

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 ...