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1·New editions are published annually and updated by weekly Notices to Mariners.

新版每年出版一次并由周版航海通告改正。

2·Up-to-date Sailing Directions are available and corrected according to Notices to Mariners.

备有最新的航海指南，并根据航海通告进行了修改。

3·Section IV of Admiralty Notices to Mariners, Weekly Editions, contains selected urgent corrections to Sailing Directions that cannot wait until the next supplement.

周版航海通告第iv部分包含有不能等待下一期补篇的对航路指南的紧急改正资料。