If you get an a/c with HF then all the better, but not a deal breaker if not. You could also rent/borrow a satphone, might be of even more help out there.
One trick to survival in seriously remote places is to have a note of the timetable of commercial traffic in the area you'll be flying in or overflying it. That way you can maximise the battery life of your handheld, making distress calls only when you've got a reasonable chance of someone listening.
The usual advice re loads of water (yes it's heavy, but you can't survive without it!), rations and emergency kit applies.
Sounds like a great trip, enjoy!
PS: One more thing. Be aware that there are very few maintenance facilities out there.
Last edited by 172driver; 24th Jan 2010 at 10:46.
Reason: spelling