https://www.carnival.com.au/legal/covid-19-legal-notices
MASKS AND PHYSICAL DISTANCING
Masks are not required on board during your cruise. However, masks will be required during the entire embarkation and debarkation process in the home port. Additionally, we recommend guests wear masks in public indoor spaces, outdoors when in large congregate events where physical distancing cannot be maintained and on water shuttles.
This is more up to date than the email that was sent out in January regarding masks on Australian cruises ...................
I was speaking to a Carnival rep last week an she advised that what was on the Covid 19 Covid protocol page was current.