Best route to become a deck officer in Australia?

Hi, I live in Australia and I’m finding it very hard to figure out what course I would need to do at the Australia Maritime College to work on the bridge on a cruise ship.
Could someone please explain which course I should choose or if I should go to another college/university?

Here’s your first lesson: Do your homework.

It took me less than five minutes on my phone, sitting in a parking lot, to find this information: