The RockBLOCK Mk2 allows you to send and receive short messages from anywhere on Earth with a clear view of the sky. It works far beyond the reach of WiFi and GSM networks. Maybe you want to transmit weather information from mid-ocean? Or use it to control your robot in the middle of the desert? Perhaps you need to communicate in an emergency, when other networks might not be available? RockBLOCK can help you.
It is an option for http://www.fishpi.org/ - an autonomous vehicle (boat) that aims to cross the Atlantic ocean on its own solar powered motive force.
If you have not seen the Iridium satellite communications network, look it up. https://en.wikipedia.org/wiki/Iridium_satellite_constellation Coverage map (yes, cool):
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