Thanks guys. Both of those look interesting.
I was not sure myself, just wanted to see if there was anything useful out there. The deckee and the zulu waterways sites seems pretty informative. I am not sure if there is more info regarding moorings, for example, than is available from the GBR Marine
Park Authority. At first glance it does appear there is more info than I had seen from the GBRMPA info. It will take me some exploring to look into these apps to realize what they offer.