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♦ S411 ECDIS charts
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Actual S411 charts
♦ Background Information
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Sea Ice Service of the World
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Ice Chart Colour Code Standard
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Understanding and Identifying Old Ice
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Manual of Standard Procedures for Observing and Reporting Ice Conditions
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SIGRID-3: A Vector Archive Format for Sea Ice Charts
♦ Links
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GMDSS-MetArea
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Polar code guidance (PAME)
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