C-Map 4D Chart AS-D050: Asia South Continental (Update) Mexico 493 makes every 4 inches

493 makes every 4 inches on the chart equal to one second of longitude

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to a large extent

11 Minimum Bend Test Radius

C-Map 4D Chart AS-D050: Asia South Continental (Update) Mexico 493 makes every 4 inchesWhy 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