Check it out here: http://www.ozpolitic.com/fish/map-gps-marks-fishing/index.html

The links take you to maps of GPS marks that you can browse on a smartphone. There is also a table/database of the GPS marks. There are about 2000 marks on there at the moment, with more to come.

I have added an option to show your current location, so it can be used like a vehicle navigator (or fishfinder).

http://www.ozpolitic.com/fish/map-gps-marks-fishing/index.html

Not sure why. I think they are only the fairly well known spots. Or they may have been bequeathed. Or they may have been provided by tackle shops etc. I am also suspicious that some have been deliberately modified and you have to give a few of your own spots before they tell you how to figure out the real coordinates - ie it is effectively a trade. They might also come straight out of a book (I know at least some of them do). Those fishing forums are strange places, a bit like a cult.