Definitions for "Almanac data"
Orbital position data for each GPS satellite. Considered not to be very accurate as the data are valid for over one month.
Constellation information transmitted by the satellites and collected by the GPS unit. Almanac data allows the unit to quickly acquire satellites as soon as it's turned on.
Constellation information (including location and health of satellites) transmitted by the satellites and collected by your receiver. Almanac data allows your receiver to quickly acquire satellites as soon as it is turned on.