Part and parcel of a voluntary program authored by CDC. Hypothetically, no cruise line ever had to follow the voluntary program.
There is another choice available. Not to participate and be color-coded gray. Choosing not to participate does not equate to lack of health protocol, so don’t get frantic.
Given the high rates of transmission during the COVID-19 pandemic, CDC currently recommends that everyone avoid travel on cruise ships, including river cruises, worldwide, regardless of their vaccination status. However, if you do plan to travel on a cruise ship, it is important to be aware of what these color designations mean. Cruise ships with a “Gray” color status have chosen not to participate in CDC’s COVID-19 Program for Cruise Ships. This designation means that CDC has not reviewed or confirmed the cruise ship operator’s COVID-19 health and safety protocols. CDC cannot confirm the COVID-19 public health measures implemented on “Gray” designated ships. Therefore, CDC does not have information about precautions and interventions, such as mask use, crew testing, or vaccination status for these ships.