I have no experience of Sat Phones, but am curious as to why the message was never delivered.....was it a problem at Nina's end (and perhaps has got worse, hence no comms since?).....and maybe they even think they are giving out updates? Of course the fact that they were clearly intending to be back in contact (rather than it being a good assumption) is a concern.
The thought also occurred to me to ask whether Nina had any solar
power (Panels) onboard - the reason for asking is that if they lost
all power (engine) and drained the batteries (without realising?) then with no solar
(or other means of generating power) then the comms would still be down, or even with solar might take a while to charge a battery
(especially in the weather
/ if it takes a while to discover which one(s) still hold a charge)......of course they may have had a generator
aboard as well.
Obviously the above stretching a bit and either already thought of or of no great use - but thrown into the pot anyway!
At the risk of second guessing the SAR folks involved (who know far more than me of the area and conditions), am thinking that perhaps a look for the vessel along the coast of Oz (including well off track), a few hundred miles or so out (beyond any reefs) might now be worth a shot, could be she is disabled and has been making slow progress, whether to intended port or somewhere else.
If it was me onboard and had lost
the electronic navigation
, then whilst comfortable with using a pencil - nonetheless my navigation
would be very very cautious, especially if my starting point was uncertain and the vessel had other problems......and that could well involve heading for somewhere well away from the intended port, simply because easier (safer) to close onto (or I was already familiar with?). Might be worth someone (who knows that part of the world well) working through any easier to arrive in places and then working backwards for a vessel that has problems (speed and / or manoeuvrability - won't want to risk a lee shore if not confident boat can claw
it's way off if needed).