From a quick look it almost looks like SPOT is what we want from, however it does not look as if it can connect to your ANT+ sensors and send that data. Correct we will need satellite data connection for this. The problem we have is that as soon as the group gets scattered some bikes will lose the wifi connection to the vehicle. Was hoping for something like Tour Tracker, but obviously that is in another league of it's own.

The thinking about it and some more research this might do what we want to. Thuraya SatSleeve