GPS-tracker features of accuracy and error
When buying or during use GPS trackers car owner may encounter issues such as the accuracy of the device and the error in determining the coordinates. First you need to decide how these devices work and what affects their accuracy.
Features of GPS-tracker
GPS-tracker - a small device capable of capturing satellite signals, orbiting the Earth, and for them to determine the geographical coordinates of your location.
The tracker uses ordinary SIM-card, which allows the owner at any time request the coordinates of the tracker, for this it is necessary only to send the number SIM-card the appropriate command from your mobile phone. The device sends a response SMS-message comprising coordinate. On them you can easily determine where the tracker and a vehicle equipped with them.
In addition, the installed SIM-card is used to transmit the coordinates via the Internet to the server, it allows for the possibility of tracking moving objects in real time.
What affects the accuracy of the GPS trackers
There are several factors that determine the error of GPS trackers, which should definitely be taken into account.
The error in determining the location
Most of the models of modern car, personal or standalone trackers provided to work correctly it possible to determine the coordinates of mestaraspolozheniya with an accuracy of +/- 2-5 meters. This is due to data transmission and reception from satellites. Some agricultural agronavigatory capable of higher accuracy - up to 1 meter. The very highest accuracy up to 2-5 cm can provide dual-frequency receivers, but they are very expensive. In general, even a conventional tracker enough to locate the object fairly accurately, the error of several meters - is not a critical component.
The accuracy of counting the mileage
In order to properly calculate the mileage, it is necessary to take into account the elevation changes are unavoidable while driving, as well as ideally repeat the trajectory of the vehicle without cuts in bends and turns. It can realize far from any tracker model - some constantly cut corners, others can not accurately take into account the height variations.
Generally, the GPS tracker mileage is calculated on the basis of information received from the satellite, and the car speedometer says it on the basis of the diameter of the tire with the help of actuators. Note that the tire wear and the development of the calculations in the speedometer may produce quite a lot of error of up to 10-15%. That is the difference between the tracker and the speedometer will almost always be the case.
Wrong data accounting for different periods
Such a situation may also arise. For example, the driver went to flight early in the morning on April 30 and at the exit recorded the speedometer to then conduct calculations of distance traveled in the past month. The driver worked all through May, performed the last flight and went back to his business on 31 May. Immediately upon arrival, he again writes the speedometer and communicates them to the employee the company's logistics services. In turn, the logistician verifies the correctness of the information provided, using data from the GPS monitoring system. It forms the report for May 1 to 31 the number of inclusive. And suddenly it turns out that the data transmitted on the kilometrage driver overstated by 800 km. Why is this happening? Because the driver went in flight on April 30, and had a day to travel 800 km, and logistician are already looking information, as from 1 May. That this was the cause of these differences. No one is deceived and the tracker worked as it should be - just because of the different accounting was a discrepancy in the data. To avoid this it is necessary to introduce stringent requirements for accounting management. If reports on the company formed from the 1st day from 00-00 hours and until the last day of the month at 23-59, then the driver should be considered is to supply the correct data. As you can see, there is little to work tracker that determines the main thing is the human factor and how to use the device's data, however, this is an important point that should not be ignored.
In conclusion, I must say that the GPS tracker - this is a very handy tool that allows you to solve a very important problem. It is indispensable in freight, as it allows owners to control the movement of transport and delivery times. In addition, even the simplest GPS trackers can determine the location of the machine within a few meters, which is very good, if the theft of the vehicle, it will be fairly easy to find.
You can buy a GPS tracker in Kiev, Kharkov and Odessa online store 130.com.ua at a good price with delivery in any city of Ukraine .