Thanks, I'll try it out immediately ... today till now I was working on the Hardware. I attached a TTL compatible GPS Module to the kobo mini (search for kobo and xcsoar to get more information about that), wraped it into a adhesive protective mass and my mum made a nice bag for it. At the back is the solar panel, if there is sun ... which is not sure for the weekend. And here are the pics:
https://www.dropbox.com/sc/dm5brg5v6...a?n=15535011#/
Now I'll turn back to the software!