In August 2010, Brazilian Naval Aviation announced that it will buy and modernized eight C-1 to served in the carrier onboard delivery (COD) and aerial refueling roles for use on its aircraft carrier São Paulo.

http://www.flightglobal.com/articles/2010/08/23/346412/brazilian-navy-buys-traders.html
http://en.wikipedia.org/wiki/Brazilian_Navy#Aircraft_inventory

C-1A Traders, not S-2 Tracker

The Brazilian Air Force used Trackers. They operated from the aircraft carrier NAeL Minas Gerais. Both S-2A and S-2E were used (respectively as P-16A and P-16E) at the end of its service in Brazilian Air Force, one S-2T was used as a possible upgrade, but due the high costs it was canceled.

http://en.wikipedia.org/wiki/Grumman_S-2_Tracker#Brazil

Brazil planned to perform a turbo upgrade on their Trackers, working with IMP of Halifax, Nova Scotia, to upgrade an initial machine as a prototype using PT6A engines. The upgrade was not regarded as satisfactory, the turboprops lacking adequate performance to get the aircraft back up into the air after a “bolter” on carrier deck landing, and the program was canceled. The Brazilian Trackers were then retired, one being donated to the Brazilian Air Force (FAB) museum in Rio de Janeiro, and the others were mothballed. Incidentally, although the Trackers were operated off the Brazilian Navy carrier MINAS GERAIS (named after a Brazilian state), they were flown and maintained by FAB crews. (The information on Brazilian Trackers was provided by Captain Marcio Jansen Calvacanti of the Brazilian Navy)

http://www.vectorsite.net/avtraker.html