Yachtmaster revision module 7 of 20
Reading nautical charts, symbols, chart correction, and navigational publications.
10 guided lessons · 20 practice questions · 17 flashcards
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A nautical chart is the mariner's map of the sea. It shows depths, coastline shape, navigation marks, hazards, and other essential information. Charts are drawn to Mercator projection, wi...
Charts use hundreds of standardised symbols defined in INT 1 (also known as Chart 5011 in the UK). Key categories include: depth contours and soundings, rocks and wrecks, buoys and beacon...
Charts must be kept up to date — new hazards, changed buoys, altered depths, and other changes are published in Notices to Mariners (NMs). Professional vessels correct charts weekly using...
Several publications supplement charts: the Nautical Almanac (e.g., Reeds or Macmillan's) contains tide tables, tidal stream atlases, port information, light lists, radio information, and...
Each chart has one or more compass roses printed on it. The outer ring shows True North (aligned with the chart grid). The inner ring shows Magnetic North, offset by the local variation....
The UK Hydrographic Office (UKHO) publishes ADMIRALTY nautical publications identified by NP numbers. NP5011, Symbols and Abbreviations Used on ADMIRALTY Paper Charts, explains the symbol...
Carriage and update duties depend on vessel and operation; for every skipper, using current navigational information is a safety requirement of a defensible plan. UKHO weekly ADMIRALTY No...
Official Raster Navigational Charts (RNCs) are digital facsimiles of paper charts: their portrayal is fixed and they do not expose chart features as individual database objects. Electroni...
Charts & Publications at Yachtmaster level is not just recall. The answer has to show command judgement, evidence quality, margin, and a fallback if the first plan stops being safe.
Decision pressure: The crew can still sail, but the plan is not defensible until the information currency is known.
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