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NAV – TIMEUTC (0x01 0x21)
It periodically polls the information about UTC time.
Header ID Data Length Data Checksum
0xB5 0x62 0x01 0x21 20 See below CK_A CK_B
Data
Offset bytes Format Descriptions Notes
0 U4 GPS time of week (ms)
4 U4 Time accuracy (ns)
8 I4 Nanoseconds of second (UTC) -500000000 ~ 500000000
12 U2 Year (UTC) 1999 ~ 2099
14 U1 Month (UTC)
15 U1 Day (UTC)
16 U1 Hour (UTC) 0 ~ 23
17 U1 Minute (UTC) 0 ~ 59
18 U1 Second (UTC) 0 ~ 59
19 U1 Flags 0x01 – valid time of week
0x02 – valid week number
0x04 – valid UTC