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Go to the '12-channel', and the rest - forget!
As GPS technology requires a minimum of three satellites - to determine the coordinates on the plane, or four satellites - to determine the grid coordinates and altitude (three-dimensional coordinates), the older models had consistently poll GPS satellites and give way to average the data collected from them. All this inevitably reduces the accuracy and promptness of navigation information, especially in critical situations.
At the dawn of the era of satellite navigation when the GPS receiver is worth more than 400 dollars, and the technology was not perfect, the GPS devices have attracted attention mainly people who are addicted to all kinds of electronic gadgets, including tourism. As soon as the price of receivers down to the level of 169 dollars, bought up more receivers, which naturally helped popularize the idea of satellite navigation. People began to realize the limitations of the method and were willing to patiently and long to choose the best place to receive data from satellites, wandering among the trees and rocks, trying to improve the accuracy of its location on the map.
When people are selected on the nature of a picnic, but instead have to spend a lot of time to determine their position in space, it is unlikely that they will want to re-spend their own money on such an imperfect technology. Everyone wanted to get navigation information quickly and easily ploys. Part of the problem stemmed from the fact that the early and more modern cheap GPS receivers used handoff method in which one or two receiving channels tracked satellites, choose a suitable, led him, shooting data, and then switches to the next satellite. As GPS technology requires a minimum of three satellites to determine the coordinates on the plane, or four satellites to determine the grid coordinates and altitude (three-dimensional coordinates), the GPS receiver had to give way to consistently poll satellites and average the data collected from them, and this inevitably reduced accuracy and promptness of navigation information, especially in critical situations.
Creating 12-channel or parallel receivers, now produced by the companies 'Lowrance', 'Garmin' and, most recently, the corporation 'Magellan' this problem has been solved. At a price of less than $ 169, such receivers use each channel to operate independently with its own satellite, the four highest-quality and stable signal used to calculate possible more accurate coordinates. Given the superiority in accuracy, speed navigation and ease of use, one can only wonder what someone else acquires and sells old-fashioned one-and two-channel receivers. Benefits of 12-channel GPS receivers are obvious and we recommend that you purchase only them.