What is GPS?

GPS means a global positioning system. It refers to a system of satellites and receivers that allow people and devices to determine their accurate placement on the ground. The heart of the system relies on 24 satellites orbiting the planet twice a day. Equipped with GPS devices receive transmissions from at least a few satellites and are able to recognize very accurate positioning data. New satellites are regularly launched to replace aging. As the technology has improved, the cost of equipment that includes this technology has decreased while the accuracy has increased. Small portable GPS receivers have become very affordable and accuracy is amazing. The accuracy varies depending on different factors, but can be as good as a few yards (meters). Ground superstructure devices can be used to improve accuracy if higher accuracy is required.

The GPS application is very wide and as prices decrease, the number of applications increases. Portable devices are used by a fisherman and tourists to make itThey helped navigate in the wild. Many new cars are equipped with GPS systems that help drivers with navigation. The army uses it to lead excursion missiles for pre -specified destinations. It is even used to watch and hunt hobbies such as geocaching.

on 2. On May 2000, the Ministry of Defense turned off selective availability (SA), which caused GPS deductions less accurate. They reserve the right to turn back on the national crisis and the like, but for the large part, GPS is now about 10 times more accurate than when selective availability has been turned on.