š Key Concepts
ā¢ Recall the IALA buoyage system shapes and meanings for lateral, cardinal, isolated danger, and safe water marks.
ā¢ Think about which buoy type indicates navigable water all around (center of channel, landfall mark) and what its topmark shape is.
ā¢ Compare the shapes in the figure with the standard safe water mark topmark, paying attention to whether itās single or paired and whether itās a ball or cones.
š Think About
ā¢ Which type of mark tells you that you are in or near the middle of safe water, rather than warning you to stay away from a danger?
ā¢ Look at each choice: which ones look like cardinal mark topmarks (used to indicate direction of safe water) and which one looks like something that might stand alone to mark safe water all around?
ā¢ Among the options, which topmark would be easiest to recognize at a distance as a single, distinctive shape associated with safe water buoys in IALA diagrams?
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Before You Answer
ā¢ Verify from your study materials what the standard IALA safe water mark looks like (color, pattern, and topmark shape).
ā¢ Doubleācheck which options in the illustration show cones versus spheres (balls).
ā¢ Before choosing, confirm that the topmark you pick is not used for cardinal marks (north, south, east, or west) or isolated danger marks.