I am using qpegps with it.
I am using tetsuu kernel with sl-c1000, and it worked without other settings than setting the baud rate to 4800. (with tetsuu kernel modules (18h) installed).
It works very well, I downloaded lots of google maps, and walked around + turned it on while riding the train and it followed me precisely. It takes from 2~5 minutes to get gmt signals at first. I am very pleased with it!!