This of course means many motorists are travelling slower than they think - which is arguably good news for avoiding accidental speeding tickets and for making our roads safer. To check, activate location services, open a map. Speedometer: Aftermarket modifications, such as different tire and wheel sizes or a change in the differential gearing, can cause speedometer inaccuracy. In order to stay within the law, carmakers calibrate their speedomters to slightly overreport their vehicles' speeds. Ensure you have the latest app version installed on your phone Ensure that your phone has a working GPS chip. So if you’re going 40mph, your speedometer may read up to 50.25mph - but it can never read less than 40mph. Under UK law - which is based on a European Union standard - speedometers must never underreport a vehicle's speed, while it must never overreport by more than 110% of the actual speed + 6.25mph. Some sat navs installed at manufacture are integrated with the car's own measurements to provide a more accurate speed reading. GPS satellites are equipped with an atomic clock, which ensures timing stability to less than one-millionth of a second. GPS satnav systems calculate your speed by using satellites - and assuming the signal is strong, they should be accurate. This likely error margin is factored in to how car makers calibrate their speedos. Fitting smaller tyres or having under inflated tyres will result in a slower recorded speed.Įven a tiny change in diameter - of say, a few millimetres - will result in an incorrect speed being recorded.
A larger diameter will result in a faster recorded speed. If the tyres or wheels are changed, this will change the speedometer reading. The car takes the recorded rotations, applies a healthy dose of mathematics and spits out a speed.īut the accuracy of a speedometer depends on the wheels remaining the same diameter as they were when they rolled off the production line.
So why the discrepancy?Ī car's speedometer works by measuring the rotations of the driveshaft, axle or wheel - rather than the speed you actually travel from one point to another. You might imagine that manufacturers ensure their speedometers are as accurate as possible.
Gps speedometer app accuracy free#
This is a free app and can work without any internet connection.Have you ever noticed a discrepancy between your vehicle's speedometer and the speed stated by your GPS system? If so, you're in good company.īut which is correct? Your speedometer or your GPS? In nearly all such cases, the speedometer is incorrect - reporting a higher speed than your car is actually travelling at. This app supports up to 48 locale languages.įirst make sure your smart phone GPS location sensor hardware works good and haven't any issue with ?️ satellite connection. ?️ Video shows instant speed view updates. You can use the app in your car, motorcycle, bicycle, and even on an airplane. ( ? ? ? ? ✈️ ? ).Ģ ) Optimize and consumes low battery power.ĥ ) Screen orientation UI Portrait and Landscape view.Ħ ) GUI with 4 different Skin-pack: Day/Night themes.ġ ) Instantly notify if speed goes beyond limits.Ģ ) Safety feature prevents from over-speeding and speeding tickets.ġ ) HUD view mirror the display to car windscreen. A handy tool who care a lot of their moving speed in traveling. OP, yes always trust your GPS speed since they are more accurate, Id say your speedo needs to be re-calibrated. Intuitive app for 5 velocity scales km/h, mph, mps, knots and ft/s. 2003 Camry owner here, tested my speedo with a GPS speed app on Android, indicted 79kmh on the app and 80kmh on the car speedo. Users choice based and selection mode to work as sync to their automobile, car and bike speed meter. GPS speedometer is design for two different speed view Adaptive and Relative.