NavCom Sapphire Rev.J - Manual (Page 384)

Sapphire Technical Reference Manual Rev. J
384
0x5b - RTK Correction Message - 4+12+(n*18) bytes
SF-3050 Sapphire SF-3040
Use with all NCT-2000D and NCT-2100D-based products.

If Survey position is greater than 1 km from navigation solution, the RTK correction
blocks (0x5b/0x5e) will not be output. Furthermore, the message 0x5c, the RTK
reference position block, will be output with an unhealthy indication and a site id of
0xffff.