Here you have Robi
There´s not much F18 fleets in Central and South America yet.

Argentina: 15-20 for year end (2008 started Racing)
Chile: 5 in a 30+ Prindle 19 fleet (beginning to migrate to F18)
Brazil: Hobie 16 14 , some N20s (hundreds of Hobie racers)
Paraguay: Big fleet of Supercats, Hobie 14s (just took one 'F18' month ago, but is more like a Pearl model, they might start sailing F18 in the future)
Uruguay: No fleet 2 F18s

Rest is Hobie 16 land: Mexico, Guatemala, Puerto Rico, Venezuela etc.
Ecuador? no info

But we started racing F18 in Argentina-South America in Jan 2008 (1st boat launched August 2006) so this is just the beginning and we already have two crews in Belguim as mentioned so we are on the right track.