The U.S. Coast Guard announced the availability of Maritime Security (MARSEC) Directive 104-06 providing guidelines for U.S. vessels operating in high risk waters. Because the Directive is designated Sensitive Security Information (SSI), it is not subject to general release. Rather, copies may be obtained from a USCG Captain of the Port (COTP) office by covered persons with a need to know. Owners and operators of vessels that may operate in areas where acts of piracy and armed robbery against ships are prevalent must include the performance standards listed in the MARSEC Directive in their vessel security plans. 71 Fed. Reg. 7054
source: HK Law