C-Map 4D Chart EW-D041: Shetland Islands (Update) Content:4D Max+ These brass bells have a

These brass bells have a high copper content which makes them stronger than most bells available on the market

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C-Map 4D Chart EW-D041: Shetland Islands (Update) Content:4D Max+ These brass bells have aWhy 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