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RXM – ALM (0x02 0x30)
It’s an input request for polling almanac data. The receiver responds with all available
(32) RXM-ALM messages defined below.
Header ID Data Length Data Checksum
0xB5 0x62 0x02 0x30 0 None CK_A CK_B
RXM – ALM (0x02 0x30)
It’s an input request for polling almanac data of one specific SV. The receiver
responds with a RXM-ALM message defined below.
Header ID Data Length Data Checksum
0xB5 0x62 0x02 0x30 1 See below CK_A CK_B
Data
Offset bytes Format Descriptions Notes
0 U1 PRN number 1 ~ 32
RXM – ALM (0x02 0x30)
It’s an output message that carries almanac data of one specific SV.
Header ID Data Length Data Checksum
0xB5 0x62 0x02 0x30 40 See below CK_A CK_B
Data
Offset bytes Format Descriptions Notes
0 U4 PRN number 1 ~ 32
1 U4 GPS week number
2 U4 WORD0
6 U4 WORD1
10 U4 WORD2
14 U4 WORD3
18 U4 WORD4
22 U4 WORD5
26 U4 WORD6
30 U4 WORD7
NOTE: 1. If the value of week number is 0, the almanac data in WORDs (0 ~ 7) are