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Major Lights correct answers high intensity, reliable light exhibited from a fixed structure or marine site primary beacons correct answers established for marking landfall e.g. lighthouses secondary lights correct answers at harbor entrances (harbor lighthouses) sector lights correct answers arcs of colors indicating dangerous waters or hazards to navigation green sector lights correct answers turning points/best water white sector lights correct answers good water red sector lights correct answers danger areas buoys correct answers mark channels, indicate shoals, obstructions, warn mariners of dangers, used where fixed aids would be impractical placement of buoys depends on correct answers purpose and position purpose types of buoys correct answers cardinal mark information/regulatory mark wreck mark isolated danger mark ODAS mark safe water mark shapes of buoys correct answers can cone sphere pillar spar IALA A correct answers "red right reaving" IALA B correct answers Even red nuns have odd green cans, red right returning US follows IALA B permanent magnetism correct answers magnetism that remains for a long time and is caused by the ship's initial construction. magnetism dissipates over time, whats left is the permanent magnitism induced magnetism correct answers the influence of a permanent magnet's magnetic field on a ship due to its presence in the field