hydrographic department meaning in Chinese

水道测量部

Admiralty sailing directions are complementary to the chart and to the other navigational publications of the hydrographic department
航路指南是对海图和气他水道部门的航海出版物的补充。
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。