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FirstGPS Starter Kit User Guide
51
Using the FirstGPS API
A
The four bit positions in the byte indicate the presence of certain data:
1. The bit with value 1 set means that the receiver has an almanac
health page. This page defines which satellites are present in the
current GPS constellation.
2. If the receiver has an almanac health page, and if it has an
almanac page for each satellite which is declared present, then
the bit with value 2 will be set.
3. If the receiver has the UTC page, then the bit with value 4 will
be set.
4. If the receiver has the IONO page, then the bit with value 8 will
be set.