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CarMinder Technology

A brief overview of the Global Positioning System (GPS)

GPS is the most sophisticated system of pinpointing a position on earth so far developed by man. The idea was conceived in 1960, and was developed by the U.S. military. The system was declared fully operational in 1995.

GPS is based on the principle of radio navigation, which has been in use since the early 20th century. Radio navigation uses a minimum of three radio transmitter towers all broadcasting a signal at exactly the same time. The transmitted signals all travel at exactly the same speed, and therefore each of these signals is detected by a receiver at a slightly different time. A calculation of these time differences is made by the receiver to determine how far the receiver is from each transmitter. With this information, the receiver can determine it's exact position.

Some vehicle location systems still use this method, but their usefulness is limited to areas within range of the company's transmitter towers. This method is also expensive to run, and these high costs are inevitably passed on to customers.

The difference with GPS is that the transmitters are satellites orbiting 20,200km above the earth . There are 24 of these satellites, all transmitting signals, and are free for the public to use.

All CarMinder units contain a GPS receiver, and are able to determine their location to an accuracy typically better than 30 meters.

The combination of GPS and mobile phone technologies is what enables us to provide you with accurate vehicle location with no on-going fees.