Yipee!
I got it working!
Can't get any sound out of it now though

EDIT: Sound seems to be working now, don't know what I did
Had a right toil! My Holux GR213 has been stuck in SirfMode but I took a dremel to it on saturday and ripped out the backup battery, froze it overnight in the freezer, and eventually it reset so I could use it in NMEA mode at 4800
TomTom seems to run pretty sweet on my Insight P4 2.4, so that might have to be stuck in the car instead of the SP13000
Not managed to get it in a front end yet though

- Trying to get it embedded in RR & CF today...