Ido in El Chalten does a very good lecture about the Caratera Austral, and about the Fitz Roy trek.
He gives very good tips also to people who want to do the Caratera by hitch-hiking or in a rental car.
Come to the lecture every day at 21:00 in the Rancho Grande hotel, its a good wayto meet other israelis who want to do the Caratera, and you get a discount card to bus tickets and buisnesses in the town.
We are 3 israelis and we´re going to do the Caratera by hitch-hiking and Ido helped us alot and gave us really good tips.