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2 illustrates a flow chart for a method of updating satellite almanac data in a wireless device for satellites not in view according to an embodiment of the present invention; and FIG.

1 illustrates a flow chart for a method of updating satellite almanac data in a wireless device according to an embodiment of the present invention; FIG.Every 20th cycle, or th of a second, the C/A code may change phase and is used to encode data message at a 50 bits/sec and to generate a 6000 km range marker.The 50 bps data is used to encode a 1500 bit long message which includes: the current GPS date/time and the GPS-UTC correction, high accuracy ephemeris information to locate the satellite, information on the current offset and rate errors for the atomic clock, low-accuracy satellite almanac data for all the other GPS satellites, and a crude estimate, based on solar flux, of ionospheric delay corrections.In step 108, the subset of the current satellite almanac is transmitted from the server to the wireless device over a communications channel. The wireless device receives the subset of the current satellite almanac from the server over a communications channel and updates the current satellite almanac stored in the wireless device.Because the subset of the current satellite almanac contains less data than the entire current satellite almanac, the peak message traffic required to update the current satellite almanac in the wireless device is advantageously reduced.

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