Differential GPS (DGPS) is to install a high-precision GPS receiver at a location that is accurately determined to form a base station. The position measurement error or pseudo-range measurement error is obtained by comparing the position measured by the base station receiving the GPS satellite signal with the known position of the station, and the error is broadcast to the surrounding space as the correction value. The GPS user receiver near the base station receives the correction signal from the base station and corrects its GPS measurement value, thus greatly improving the positioning accuracy. Many GPS device providers set up DGPS transmitters in some areas for free use by customers with DGPS-enabled GPS receivers.

　　When choosing a GPS device, users should consider some physical factors besides navigation performance. With the continuous development of navigation technology, especially the appearance of the third generation of Sirf navigation chip, GPS products have been further improved in navigation performance, so that the new generation of GPS products have little difference in positioning and navigation performance. In addition to looking at the product positioning and navigation performance when buying products, we should also consider the size, weight, display screen, waterproof, shockproof, dustproof performance, high temperature resistance, power consumption and other physical indicators.

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