I imagine they might want a General license because you won't transmit beyond the island on a Technician license. Just a guess.
EDIT: actually read the fine article, HF voice being one of the requirements. I assume they also want more than the tiny bit of HF that Technician licensees get to use. " Sorry, 10m isn't open, so I can't transmit, and I'm not allowed to use 40m."
EDIT: actually read the fine article, HF voice being one of the requirements. I assume they also want more than the tiny bit of HF that Technician licensees get to use. " Sorry, 10m isn't open, so I can't transmit, and I'm not allowed to use 40m."