Article ID : 00012364 / Last Modified : 08/16/2015

Why does the GPS assist data need to be updated every 30 days?

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GPS assist data is actually the predicted orbital location of each satellite over the course of a 30 day period. Slight variances occur in the actual locations of the satellites due to the speeds at which they travel in relation to the rotation of the earth. For this reason, GPS assist data should be updated every 30 days to reestablish the predicted orbital location of each satellite.