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MSIB: COVID-19 Safety Requirements in the Maritime Transportation System: Change-3

The Coast Guard Assistant Commandant for Prevention Policy has published Marine Safety Information Bulletin 02-21 Change 3 “COVID-19 Safety Requirements in the Maritime Transportation System” to provide notification that mariners on “Non-passenger- carrying commercial vessels operated by a team of mariners who all live on the vessel” are exempt from wearing a mask.

The President issued Executive Order (13998), Promoting COVID-19 Safety in Domestic and International Travel requiring masks be worn on all “public maritime vessels, including ferries” to mitigate the risk of spreading COVID-19. The Centers for Disease Control and Prevention (CDC) issued a Federal order, Requirement for Persons to Wear Masks while on Conveyances and at Transportation Hubs, 29JAN2021 (the Order) requiring all persons travelling on all commercial vessels to wear a mask. Additionally, Executive Order 13998 directs the Coast Guard to implement public health measures consistent with CDC guidelines at sea ports (e.g., passenger terminals, cargo handling facilities, and other shoreside facilities that provide transportation of persons or cargo). The CDC recently updated their website noting that the following category of mariner is exempt from wearing a mask: “Non-passenger-carrying commercial vessels operated by a team of mariners who all live on the vessel and are the only people on the vessel are also permitted to use this exemption.” This exemption can be found on the CDC website Requirement for Face Masks on Public Transportation Conveyances and at Transportation HubsChange-3 to this MSIB reflects that mariners on “Non-passenger- carrying commercial vessels operated by a team of mariners who all live on the vessel” are exempt from wearing a mask. A mask will still be required when the vessel receives persons who are not a part of the team of mariners that live on the vessel. 

The previous guidance regarding the enforcement of mask wear in outdoor areas remains in effect. Though the CDC is no longer requiring mask wear in outdoor areas, operators of conveyances and transportation hubs, at their discretion, may require masks to be worn in outdoor areas. An outdoor area on a vessel is a space that is permanently open to the weather on one or more sides and, if covered by a deck or canopy, any spot on the overhead is less than 15 feet from the nearest opening. This updated guidance does not supersede any federal, state, local, tribal, or territorial laws, rules, and regulations that still require the wearing of masks in outdoor areas of conveyances and while outdoors on transportation hubs. 

Conveyance operators must continue to require all persons onboard to wear masks when boarding, disembarking, and for the duration of travel, unless they are located in outdoor areas of the conveyance (if such outdoor areas exist on the conveyance). Operators of transportation hubs must require all persons to wear a mask when entering or while indoors on the premises of a transportation hub. 

Vessel operators are reminded that operational limitations including vessel stability and egress requirements may limit the number of people on each deck. Masters and crew remain responsible for ensuring the vessel remains in compliance with the applicable requirements. 

Operators of cruise ships subject to the Conditional Sailing Order must continue to follow the requirements of any technical instructions and the operations manual available on the Cruise Ship Guidance webpage

Vessel and sea port operators are encouraged to monitor the CDC website at for the most up to date guidance. The CDC has published an updated list of frequently asked questions (FAQs) that can be found at Public Transportation. The Coast Guard has also published additional guidance that can be found at the FAQ web page

The Order requires conveyance operators and transportation hub operators to take steps to reduce the spread of COVID-19. 

Vessels (Conveyances): Vessel operators must use best efforts to ensure that any person on the conveyance wears a mask when boarding, disembarking, and for the duration of travel that is indoors. Depending on the circumstances, best efforts include: 

Sea Ports (Maritime Transportation Hubs): Operators of sea ports must use best efforts to ensure that any person entering and when indoors on the premises of the port wears a mask. Best efforts include: 

The CDC Mask Order exempts the following categories of persons: 

Vessel or facility operators, owners, or companies should provide clear guidance as to when wearing a mask would create a risk to workplace, health, safety or job duty for crew members and facility personnel. The company guidance should address specific tasks that cannot be accomplished safely while wearing a mask. A blanket policy cannot be issued to exempt all persons from wearing a mask at all times. Crew members and facility personnel may be exempt from wearing a mask only when actively performing the task and should immediately wear a mask when the task is complete. Since passengers should refrain from instances where wearing a mask may present a risk, this exemption does not extend to passengers. 

The requirement to wear a mask shall not apply under the following circumstances: 

Under Title 42 of the United States Code section 268, the Coast Guard is charged with assisting in enforcement of CDC quarantine orders. Operators of vessels and sea ports that fail to implement appropriate public health measures, including the mask wearing order above, may be subject to civil or criminal penalties. Furthermore, based on the scientific determination of the CDC, the Coast Guard finds that failure to implement appropriate health measures creates an undue safety risk by increasing the risk of transmission of COVID-19 between passengers, the crew of the vessel, and port workers. 

The Coast Guard has broad authority to control the movement and operations of a vessel based on a hazardous condition (see 33 CFR § 160.111). Vessels that have not implemented the mask requirement may be issued a Captain of the Port (COTP) order directing the vessel’s movement and operations; repeated failure to impose the mask mandate could result in civil and/or criminal enforcement action. Additionally, after taking into account operational considerations, the COTP may issue orders prohibiting vessels from mooring at a sea port that fails to implement the CDC guidelines or refer non-compliance with CDC’s guidelines for further civil or criminal enforcement action. 

Persons that wish to report vessels or sea ports not operating in accordance with the Executive Order or CDC Order may email the Coast Guard at This shared email inbox is not monitored on a continuous basis. If there is an emergency, it should be reported through proper emergency channels to local authorities not this inbox.

State, local, Tribal, and territorial laws or rules imposing public health measures that are more protective of public health than, or equal to those required by the CDC are an acceptable equivalency for these requirements. Operators of vessels and sea ports who believe local mask wearing requirements fit this exemption should contact the local COTP. 

Questions concerning this notice may be forwarded to Coast Guard Office of Commercial Vessel Compliance, at

This blog is not a replacement or substitute for the formal posting of regulations and updates or existing processes for receiving formal feedback of the same. Links provided on this blog will direct the reader to official publications, such as the Federal Register, Homeport and the Code of Federal Regulations. These publications remain the official source for regulatory information published by the Coast Guard.

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