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Tips and questions relating to the GPS modules from SFE
By mluckham
#110751
I found this post entitled
Putting your EM-406 GPS back in to NMEA mode without waiting
at http://diydrones.com/profiles/blogs/put ... e=activity, it may prove useful to someone.

It does work, provided you send the commands to the SiRF chip at the baud rate it was programmed with previously ... try different baud rates if it doesn't work for you.

By the way, you can find the SiRF Binary Protocol manual at http://www.usglobalsat.com/downloads/Si ... otocol.pdf