How would I find a ship's history, with it's name, registration #, port city, and a picture of it in Sardinia?

I saw this yacht, the "sydney rock oyster" #858574, at 18.59m and from Sydney, Australia. Now, I'd like to see if I could (in a stalker-ish way) find out where they've been and where it's going. Just out of curiousity :)