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⇛ Actual S411 charts

⇛  Sea Ice Service of the World
⇛  Ice Chart Colour Code Standard
⇛  Understanding and Identifying Old Ice
⇛  Manual of Standard Procedures for Observing and Reporting Ice Conditions
⇛  SIGRID-3: A Vector Archive Format for Sea Ice Charts

⇛ GMDSS-MetArea

⇛ Polar code guidance (PAME)