Que haces, capo. It's good to see an argentinean here

There are no argentinean maps for the built-in Wayfinder application. So you won't find any turn-by-turn navigation solution.

What you can find is Maemo Mapper using OpenStreetMap (http://www.openstreetmap.org/) maps that has the City of Buenos Aires complete.

But to be honest, without turn-by-turn navigation it sucks and big time.

Saludos!

PS: Cualquier cosita mandame un PM