A few more details:
from 'Lectronic Latitude It's the second article down.
"They were in a small inflatable for three days. I don't know what kind of GPS/beacon they had -- seems like they could only signal for help now and again."
I don't know much about them, but I'm assuming they have batteries? If no one is responding at 0900, probably no one will respond at 0915. I would think they were rationing the batteries.
According to the article above, they both had an EPIRB. Rarely do we hear of two people in the same incident with such a useful tool!
Sue