May need different systems in different parts of the world. Focus here is on North American waters
Different physical installations
Remember that the antenna needs to be in line of sight of the satellite
Some satellite telephones have a built-in antenna, which makes them larger than a comparable pure cellular phone.
Others put a weatherized antenna on the vessel and cable handsets (or data when used to it)
Will try to use cheaper cellular radio before satellite
Basic speeds are 9.6 to 38.6 Kbps, with caching and acceleration software available
Direct firewalled Internet access