User:Deanna Earley/SiRF Star III

A number of poeple have a SiRFStar III based GPS mouse but use Linux and so, are unable to run the included GPSInformation utility. With the use of Portmon from SysInternals, I have been able find out what commands you need to enable WAAS/EGNOS, etc..

These all follow the standard NMEA format witht he checksum and CR LF on the end of the sentance (after the asterisk)

WAAS/EGNOS

Enable:

$PSRF151,01*0F

Disable:

$PSRF151,00*0E

with sirfmon (part of the gpsd package) you can activate WAAS mode using the binary sequence:

s 85 01

s

send command

85

DGPS Source

01

SBAS

Power saving

Enable:

$PSRF150,0,300,1000,1*10

Disable:

$PSRF150,0,1000,1000,0*23

External links

• http://www.stc-ek.ru/4/em401_userman.pdf

SiRF Binary and NMEA docs are available here:

• http://www.usglobalsat.com/custom.asp?recid=6
• http://www.usglobalsat.com/downloads/SiRF_Binary_Protocol.pdf
• http://www.usglobalsat.com/downloads/NMEA_commands.pdf
• http://www.elgps.com/public_ftp/Documentos/SIRF_Protocol.pdf