| http://www.w3.org/ns/prov#value | - Flip Cards is a system of learning using playing card sized cards that has been developed over more than 30 years to be the most effective, simple, method of learning and checking knowledge of maritime systems, codes and rules.Each card shows the symbol or has a question on the face, with the answer on the back.Invaluable for yachtsmen (especially those taking the excellent RYA Yachtmaster, Day Sk
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