Some great news!
We now have a solution for two-way communication with the Auton boat (Will only be one way on the Microtransat challenge). Essex based Rock 7 have kindly sponsored us by supplying one of there new RockBlock modules. The RockBlock uses the Iridium Satellite network. Specifically, the Short Burst Data service. You can read more about it the rock7mobile website. Below are some more pictures of the prototype.