admiralty chart meaning in English

海军图表
海图；航海图
英版海图

The notices are published in weekly editions , and are issued by the hydrographic department on a daily basis to certain admiralty chart agents
通告是以周版形式发布，并由水道部门每天向一些英版海图代销点传输。
Each admiralty chart carries a reference number . the reference numbers are allocated in a random manner and charts in a particular area frequently do not have numbers running in sequence
每张英版海图都有一个图号。图号是随机分配的，对某一特定水域图号不是连续的。