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NAV – STATUS (0x01 0x03)
It periodically polls navigation status.
Header ID Data Length Data Checksum
0xB5 0x62 0x01 0x03 16 See below CK_A CK_B
Data
Offset bytes Format Descriptions Notes
0 U4 GPS time of week (ms)
4 U1 Navigation modes 0x00 – no fix
0x01 – dead reckoning
0x02 – 2D fix
0x03 – 3D fix
0x04 – GPS + dead reckoning
0x05 ~ 0xFF – reserved
5 U1 Flags 0x01 – GPS fix ok (under DOP
and accuracy masks)
0x02 – DGPS used
0x04 – week number valid
0x08 – time of week valid
the rest of them – reserved
6 U1 Differential status Bits[1:0] – DGPS input status
00 – none
01 – PR+PRR correction
10 – PR+PRR+CP correction
11 – high accuracy PR+PRR+CP
correction
the rest of bits – reserved
7 U1 Reserved
8 U4 Time to first fix (TTFF) Millisecond time tag
12 U4 Millisecond since startup/reset