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GPS guidance systems can add a lot to the price tag of a telescope. However, a GPS system is only necessary in certain situations. A telescope equipped with GPS will use the guidance system to perfectly calibrate the telescope's automatic computer location and tracking functions. This is most useful for professionals who need incredibly accurrate guidance information and for any telescope user who frequently transports their telescope to many different locations. If you are a first time buyer, then a GPS system is unnecessary, unless you plan on taking your telescope to many different viewing sites.