well, I tried to translate that gpss.co.uk page and what I think I found is:
1.The software is free, if you aren't a business and want to sell it and you take the quiz (?)
2.It just works with your gps dongle and windows (?)
3.Doesn't need much computing power to run (?)
This could be the easiest and most inexpensive way to do this if we can find a pc that is:
1. very small
2. no display
3. doesn't use much power.
The smallest cheap pc I have found is the boundless virgin webplayer. It is about the size of a small laptop (with a screen), and a little lighter. And I believe it has a dc power supply. It doesn't have a harddrive, but a small laptop drive can be purchased. Without the harddrive, the unit cost me $35, brand new.