C-Map 4D Chart NA-D940: Cape Cod,Long Island & Hudson River (Updated) North America Whether you are an experienced

Whether you are an experienced captain or a weekend boater

British Admiralty Nautical Chart 1289: China - Weihai Gang to Shidao Gang is a standard nautical chart

If an area is particularly affected by natural disasters

In August Gale

Underlying legal concepts behind the registration of ships

C-Map 4D Chart NA-D940: Cape Cod,Long Island & Hudson River (Updated) North America Whether you are an experiencedWhy Update Your C Map Chart? Why Update Your C Map Chart? It is very important that the latest C Map charts are used when sailing out in the open water for safe navigation purposes. The C Map electronic chart libraries get updated twice a year to coincide with popular boating sessions. Included in the library updates are the latest notice to mariner updates from government hydrographic offices, updates to marina facilities, port services, photos and