Would you happen to know the transmitter sites locations for The Cenamer Frequencies off hand or anyone for that matter ? Might take a trip to a few Central American airports with scanner aboard sometime soon.
I don't have the precise locations, but I know there are transmitters in Panama, and Guatemala, at a minimum, and I am sure there are several more. I will try to get more information.
This is the organization that apparently runs Cenamer Control: http://www.cocesna.org