PJ they have a utility called NAVilink, download from their web or on the CD that came with your 31, it's been many moons since I have used NL so no how too's from me. You can save your data to card and then get it that way, much easier.
I believe the biggest card is 2GB, copy and pasted below 
Benny can help 
Oh and formate the card via the 31 a couple of times before use.
GT-31 provides power of 2.8VDC.
The following cards have been tested to work with GT-31:
SanDisk 2GB
Transcend 1GB
Kingston 2GB
PNY 2GB
Apacer 2GB 60X
Compatible/Suggested SD card to go with Locosys GT-31/BGT-31 or SD cards (<=2GB) with 2.8VDC(3.3VDC~2.7VDC) power input should work.
yep, but you need the app, I think it's called navilink, it's downloadable from the locosys site.
The biggest card you can use is 2gb, just shows how old this thing is! I think they're still available in micro SD format, you just need a standard SD card adapter.
well done Firie beat my by seconds
Select to expand quotefiriebob said..
Wish I was faster than you on the water Mike 
wait till the wind blows mate, I'm sure you'll go then.
Cheers lads, I ended up pulling an old card out of something that seems to work after spending ages trying to muck around just with the cable.
To easy.
