> That requires intersat communications which the RV plan doesn't provide.

Intersat (laser links) comms is not available at the moment. Fairly sure they simply geofence non-maritime accounts. As you can see from the maritime map, it only covers water next to the shore which is a good indicator that they still use ground stations directly to provide service.

EDIT: looks like it's not geofenced based on some other people's comments who've been using the standard terminal on boats.