i found this tool which is sort of nifty but not really for nautical applications.
[url="http://imagery.maps.nsw.gov.au"]http://imagery.maps.nsw.gov.au[/url]
this link could prove useful:
[url="http://www.waterways.nsw.gov.au/maps.html"]http://www.waterways.nsw.gov.au/maps.html[/url]
[url="http://imagery.maps.nsw.gov.au"]http://imagery.maps.nsw.gov.au[/url]
this link could prove useful:
[url="http://www.waterways.nsw.gov.au/maps.html"]http://www.waterways.nsw.gov.au/maps.html[/url]