@see http://wiki.openstreetmap.org/wiki/RTKLIB#Unofficially_supported_hardware

Unofficially supported hardware

All U-blox Antaris4-based receivers, ublox5 with external flash firmware, all ublox6-based receivers can be used with rtklib by enabling RXM-RAW, RXM-SFRB (or optionally TRK-SFRB) output messages. ublox5 rom-based hardware is not (yet ?) supported, because U-blox has removed raw data logging functions from the firmware. To enable raw data output on antaris4 the following CUSTOM UBX message can be used

b5 62 09 01 09 00 14 6c 00 00 00 00 00 00 ff 92 f7

For ublox6 ROM6.02 use

enable RXM-RAW

b5 62 09 01 10 00 dc 0f 00 00 00 00 00 00 23 cc 21 00 00 00 02 10 27 0e

enable RXM-SFRB

b5 62 09 01 10 00 08 11 00 00 00 00 00 00 0f cc 21 00 00 00 02 11 42 4d


For ublox6 ROM7.03

enable RXM-RAW

b5 62 09 01 10 00 c8 16 00 00 00 00 00 00 97 69 21 00 00 00 02 10 2b 22

enable RXM-SFRB

b5 62 09 01 10 00 0c 19 00 00 00 00 00 00 83 69 21 00 00 00 02 11 5f f0