There is a requirement for NZ boats going more than 50 miles offshore to meet category 1 standards ie
SSB or sat ph
epirb etc. The crewing requirement is that someone has the required knowledge and experience to do the voyage and navigate without
gps. This may be practical experience or a theory plus practical qualification like Ocean Yachtmaster. It only applies to NZ boats which must be registered. If you are an Australian citizen you can register it as an Australian ship prior to leaving. The MSA requirements then don't apply. Commonsense still says the boat and skipper are equipped for the passage.