1 黑名单证明。典型的是阿拉伯国家所要求的抵制以色列证明（Certificate of Boycott Israel）。其通常规定为：The vessel carrying the goods is not Israeli and will not call on any Israeli ports while carrying the goods and that the vessel is not banned entry to the port of the Arab States for any reasons whatever under law and the laws and regulations of such Sates allowed（船上所装货物为非以色列原产，船不经停任何以色列港口，船只可依法自由进入阿拉伯国家法律和规则所容许进出的港口）。

    2 班轮公会证明（Conference Line Certificate）。信用证规定货物须装班轮公会船只时，向银行所交单据中应包括船公司或船代出具的证明。例1，信用证要求“A certificate issued by the carrier,shipping Co or their agents certifying that shipment has been effected by conference line and/or regular line vessels only covered by institute classification clause to accompany the documents. 其意思是由承运人、船公司或他们的代理签发证明，证实货物业已装运在符合伦敦协会船级条款的班轮公会船只或定期船上，该船证随单据提交。例2，某信用证要求“Shipping companys certificate stating that the carrying vessel has entered P&I Club and should be attached with the original documents” 其要求船证应明确载货船舶系船东保赔协会成员并应随附正本证明。

     3. SMC、DOC和SOLAS。这几个缩略语近年来常出现在信用证的要求中，SMC（Safety Management Certificate 船舶安全管理证书）和DOC（Document of Compliance安全符合证书，也有人称其为船/港保安符合证书）是按照国际安全管理规则（ISM）的规定载货船舶应在船上拥有的必要证书。我国海事局按ISM的规章发给船公司DOC，船舶则可获SMC，如船公司没有相应证书，那么就没有办法按信用证要求来出具此类证明。信用证中的一般要求是：“The carrying vessel should comply with the provisions of the (ISM) Code which necessiates that such vessel must have on board, copies of the two (SMC and DOC)valid Certificates and copies of such certificate must be presented with the original documents.”也可体现为“Certificate issued,signed and stamped by the owner/carrier/ master of the carrying vessel holds valid ISM certificate and ISPS (International Shipping And Port Security Safety Code《国际船舶和港口设施保安规则》)”；SOLAS指的是《1974年国际海上人命安全公约》（简称SOLAS公约）。“9·11”事件后国际海事组织于2002年12月召开缔约国大会通过对SOLAS公约的修正案，并在2004年7月1日起开始实施。按上述有关规定，船舶应持有“安全管理证书”正本，其船名与国籍证书一致，所载公司名称与“符合证明”中的公司名称相一致。