Hi sweetred61, welcome to Cruise-Chat! Congratulations on your up-coming cruise! They offer auto-tipping here in the states, it's just added to your on board account. They also offer prepaid gratuities, so that you can have everything paid for before you depart. You might want to check with your travel agent or with RCI to see if those options are available to you as well. The ships usually operate in USD, at least here in the states, but I'm sure they can handle any currency at the purser's desk. Again, I'd give my travel agent or RCI a buzz and ask. Maybe we have some Australian members that can answer conclusively. I don't want to give you any bad information
Hope you have a wonderful cruise!