When first starting a GPS, many users will notice that it takes quite a while for the unit to provide a usable location reading. The reason is that the unit is downloading, from the satellite radio signal, a corrected clock reading generated from atomic clocks on the satellites. This data enables the satellites to calculate their positions correctly and account for normal changes in orbit. This then enables the receiver to calculate its corrected position on Earth. This corrected reading is critical to the function of the GPS receiver because it also defines the locations of the satellites from which the receiver can receive signal. The data that is received is referred to as Almanac Data.
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