G'day Pootsy,
I don't have any marks myself but you could try these marks from 500 hot fishing spots
Outer Rocks 4.3 klm Bustard Heads 23.28.750 151.46.510
North Bustard 22.4 klm Bustard Heads 23.54.420 151.57.400
Seventeen Seventy 52.1 klm Bustard Heads 23.40.020 152.08.000
Hoskyn Reef 52.9 klm Round Hill heads 23.28.000 152.16.500
West Hoskyn Reef 50,7 klm Round hill heads 23.48.000 152.14.990
The Ledge 31.3 klm from Round Hill heads 24.06.000 152.12.200
The Pinnacle 47.4 klm Round Hill heads 24.07.000 152.22.150
West Lady Musgrave 52.9 klm Round Hill heads 23.54.650 152.21.400
West Fairfax Island 52.3 klm Round Hill heads 23.53.000 152.19.900
Stuart Shoal 64 klm Round Hill heads 23.52.100 152.27.910
At least that's a starting point...Hope you have a good trip
Rhys