Yes quite true captn, I was however thinking more local for me such as a flight from Adelaide to say Ceduna or beyond. 2 gulfs to cross enroute and a lot of nothing beyond. I have found over the years a flight note to be as good or better than any sartime providing you have a reliable person holding it such as your wife,son ,daughter etc. As they have a vested interest in your well being as well as knowledge who you are off to see,stay etc if the mobile doesn't work and know exactly who and when to call if concerned at all. Might not work for all but for me it does. Hand held epirbs best for immediate alarm and will pinpoint your whereabouts to meters. Never had them/allowed when I started flying only fixed elb's that found crash sites but rarely survivors. But ofcourse what would I know.As for radio coverage,if help needed call the overflying jet traffic on their frequency listed in ERSA. Only needed to once in 35years found them happy to forward ammended sartime for me.