Publishing hydrographic publications
The Hydrographic Service collects data at sea regarding the seabed, the locations of shipwrecks and other underwater objects, and also maps shipping routes. The Service enters this information in a database.
Charts and publications
The Hydrographic Service uses the information from the database to produce nautical charts, official nautical charts for coast and inland waterways (the 1800 series), mariners guides, current atlases, tide tables and Notices to Mariners (NtMs).
More information about these subjects is available on:
- Notices to Mariners (NtMs);
- nautical products;
- coordinate systems at sea;
- maritime zones and sea boundaries.
Information about sale is available on the page Sale of nautical charts, publications and hydrographic data.