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Retrieved from "http://wiki.openmoko.org/wiki/Hammerhead/Protocol"
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Christian did some stracing on TomTom device, and result is great logs at http://www.maintech.de/download/hammerhead-strace.log .

GPS seems to communicate in packets.

Direction GPS -> machine

read(3, "\xfe\x00\xfd\x80\x16\x19\x0b\x00\x00\xfc", 2048) = 10

\xfe: begining of packet \x00: type of packet? seems to determine length. \xfd: follows .... \xfc: packet end

GPS signals at wikipedia seems to be required reading: http://en.wikipedia.org/wiki/GPS_signals