| http://www.w3.org/ns/prov#value | - ernet connection required.- Simple, easy to use navigation for quick reference.- Every IALA buoyage marker available at the touch of a finger.- Expertly drawn illustrations accompanied by clear, concise descriptionsIf you are responsible for a vessel at sea, no matter how small or large, you must be able to recognise different types of navigation marks, day or night, and know what they mean.
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