应该就是船舶或是合同或是邮件中的承运船的意思,如下面两句中的 performing vessel,
THE PERFORMING VESSEL IS A REGULAR/CONFERENCE LINE COVERD BY INSTITUTE CLASSIFICATION CLAUSE;
THE PERFORMING VESSEL CARRIES A SAFETY MANAGEMENT CERTIFICATE;
承运船舶是国际船级社承认的定期/协会班轮
船舶有安全管理证书