Which Is More Accurate: GPS or Car Speedometer?

Both systems have a different measurement form, but which one is more accurate?

Which is more accurate: GPS or car speedometer? This sure question that rounds the head of more than one and more than two drivers at the end of the day and is that although we think otherwise, they do not measure the same. The claim that GPS navigators have made life much easier for drivers is true, but sometimes it may get us into the odd mess.

GPS is really useful when you go on a trip, and the route is unknown. In addition, it also helps to know the speed or even anticipate the departures or the most dangerous sections. Although they have good things, they also have them not so good. The speed difference between the GPS and the speedometer in is one of them.

This difference can reach up to 5%. For what is this? Which of the two, the speedometer or the GPS, is right? It is important to note that both have the same objective; Calculate the distance we travel based on the time spent, but each uses a different system.

GPS or Car Speedometer

The speedometer, how does it work?

The speedometer has an indifferent operation of an analogue, digital or even virtual. It likes the ones Peugeot is beginning to equip in its models. The i-cockpit devices measure instantaneous speed of the vehicle through the rotation at the wheels rotate or the second axle of the gearbox; the one that transmits the power to the differential.

Through an equation, it becomes kilometres per hour. If the wheel rotation measurement is taken into account, it can be said that the calculation can be altered. The pressures of wheels, the weight of set, the type of tires, or the size of tires can create variations.

This is one of the reasons why radars have a small margin of error. On roads with speeds greater than 100 km/hour it is 7% while if the speed of the track is lower, 7 km/hour is taken as the margin. It is important to know that the European Union obliges manufacturers to have speedometers with a maximum speed error plus 10% of the Mista and another 4 km/hour extra. That is, at a speed of 100 km/hour, the error limit would be 14 km/hour.

In addition, it is important to know that although the vehicle knows the actual speed at which it is travelling on a highway, it will always mark 10 km / h more. A Toyota Auris on the highway has been tested. During the march, the on-board computer was reset for a few kilometres straight and a constant speed of 120 km/hour was maintained, with the speed control activated. When the computer was checked after these kilometres, it could be seen that the average speed it marked was 110 km/hour. Ten kilometres less than what the speedometer marked.


GPS navigators, how do they work?

GPS navigators use a system that is directly related to satellites. These determine the position we are in, and through that position, the GPS determines the time that elapses until the next stop. This calculates the speed at which we are travelling with the vehicle.

It should be noted that not all GPS navigators offer the same accuracy. This means that the measurement could be affected by the power with the signal; the satellites are sent and received.

Which is more accurate: GPS or car speedometer?

Keep in mind that the speedometer of the car is usually more accurate than GPS navigators, especially if it runs at high speeds that exceed 100 kilometres/hour.

In the case that it circulates at lower speeds, the results could be matched, since the possible error produced by the revolutions is also much smaller.


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