Central America
The Inmarsat satellite is located right over Central America. Inmarsat phone is therefore the first choice.
Satellite communication in Cuba
Import and use of satellite based communication devices are restricted by the Cuban authorities.
If the immigration authorities find such equipment it will be confiscated, it requires considerable efforts to get it back when you leave Cuba. If and in which way these rules will be applied if you reach Cuba with a vessel with build in satellite devices is beyond our knowledge.
Despite any rules the devices are working, as we specially know for Iridium devices due feedback from our customers.
Information from March 2018. Source: Allan&Associates (no longer available)
Visitors are required to obtain authorization to bring satellite phones into Cuba.