Every year around March, the new edition of the General Catalogue of Navigation Books will be updated, and the specific update date will be announced in the Chinese version of the Navigation Notice.

The area of ocean accounts for nearly 70% of the earth's surface area. After the arrival of the Middle Ages, the navigation industry developed rapidly, and nautical charts became a treasure map for adventurers to compete in Omhala. Definition name: nautical guide-chart keywords or keywords: geoscience charts are divided into ordinary charts, nautical charts and harbor charts according to their uses.