Regardless of the technology being used, the accuracy of a fix taken at a particular time and location on the Earth’s surface depends on the number of satellites that are visible to the receiver and how widely those satellites are dispersed across the sky. Web-based tools called DOP (dilution of precison) calculators are used to predict periods of unfavorable satellite geometry. This one is hosted by Navmatix s.r.o., a publisher of mobile applications for marine use. CHECK IT OUT
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