74
AID – ALM (0x0B 0x30)
It’s a poll request when “data length” is equal to 0. Poll all available aiding almanac
data.
Header ID Data Length Data Checksum
0xB5 0x62 0x0B 0x30 0 None CK_A CK_B
AID – ALM (0x0B 0x30)
It’s also a poll request. Poll a specific aiding almanac data.
Header ID Data Length Data Checksum
0xB5 0x62 0x0B 0x30 1 See below CK_A CK_B
Data
Offset bytes Format Descriptions Notes
0 U1 PRN number This will request the desired
almanac data for the specific
GPS satellite
AID – ALM (0x0B 0x30)
It’s an I/O message. Poll aiding almanac data.
Header ID Data Length Data Checksum
0xB5 0x62 0x0B 0x30 40 See below CK_A CK_B
Data
Offset bytes Format Descriptions Notes
0 U4 PRN number The following data are for this
specific satellite
4 U4 Issue date of Almanac GPS week number.
If this value is equal to 0, the
following Words (0 ~ 7) don’t
contain the valid data.
8 U4 Almanac – WORD0
12 U4 Almanac – WORD1
16 U4 Almanac – WORD2
20 U4 Almanac – WORD3
24 U4 Almanac – WORD4
