GNSS Almanac Purpose RNAV
If the data for the visible satellites is stored each time a GNSSGNSS —Global Navigation Satellite System unit is switched off, then when the unit is turned on again in a similar location it is likely the same satellites will be in view, and therefore a fix can be obtained more rapidly. You may have noticed that after you take a long haul flight, that your phone or other device takes a lot longer to establish its location. This is why - it needs to download the Almanac data for the "new" satellites and so takes longer.
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Why is the Almanac data stored in the user segment when it is not using the GNSSGNSS —Global Navigation Satellite System?