Nautical charts — Maritime infrastructure

Maritime infrastructure contains subsea cables, pipelines, air spans with frisai height, bridges with free sailing height, aquaculture with mooring cables, wrecks, booklets, dumping fields in the sea etc. that are reported for publication in nautical charts and which may be useful to have as underlying information when planning activities in the coastal zone.

Maritime infrastructure is only established in salt water.

海事基础设施（Maritime Infrastructure）涵盖海底电缆（Subsea Cables）、海底管道、带有frisai高度的架空跨海结构、具备通航净空高度的桥梁、配有系泊缆绳的水产养殖设施、沉船残骸、小型手册（Booklets）以及海上倾倒区等设施。上述设施均需经申报后方可纳入海图出版范围，且在开展海岸带活动规划时，可作为核心基础信息供参考使用。

海事基础设施仅存在于咸水水域中。