I see! Do not ask me why, the trivia name for it in French is balloon (hot water balloon to be accurate) :o
I am in the process of fine tuning the prototype and its micro-code. You will have to use a shield for the SD card: you may consider Adafruit's one (blank GPS shield) or make your own from the Adafruit's proto shield and hack a 1$ USB SD card reader. Then you might not need all the functions that I designed (100 bytes left in Flash...). I will consider publishing a lighweight version. 
Kind regards
Didier