Table 10-10 Bin 98 Message
Name Components Type Bytes Value
AlmanData Almanac-derived-data, 8
satellites at a time
Structure
array
8 x 8 = 64 See the
following table
LastAlman Last almanac processed Byte 1 0 to 31
IonoUTCVFlag Flag that is set when
ionosphere modeling data is
extracted from the GPS sub
frame 4
Byte 1 0 = not logged
2 = valid
Spare Not used at this time Unsigned
short
2 Future use
AlmanData Structure Array
Name Components Type Bytes Value
DoppHz Predicted Doppler in Hz for the satellite
in question (assuming a stationary
satellite).
Short 2
CountUpdate Number of times the almanac has
changed for this satellite since the
receiver was turned on
Byte 1 Positive
Svindex Channel number (groups of 8) Byte 1 0 to 7
8 to 15
16 to 23
24 to 31
AlmVFlag Almanac valid flag Byte 1 0 = not logged
1 = invalid
2 = valid
3 = has data
(not yet
validated)
AlmHealth Almanac health from sub frame 4 of the
GPS message
Byte 1 See ICD-GPS-
200
Elev Elevation angle in degrees Char 1 -90 to 90
Azimuth ½ the azimuth in degrees Byte 1 0 to 180
represents
360 degrees
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