🔍 Key Concepts

• Regulatory marks in the U.S. Aids to Navigation System use different geometric shapes to convey meanings such as danger, exclusion, or information. • The daymark for danger is related to the same shape you see on white/orange regulatory buoys that say "DANGER" on them. • Contrast the shapes used for lateral aids (port/starboard marks) with those used strictly for warnings.

💭 Think About

• Which of these shapes most closely matches the shape printed on regulatory buoys that mark rocks, shoals, or other hazards? • Two of these shapes are commonly associated with port and starboard lateral marks—eliminate those first, then decide between the remaining options. • Think about highway or safety signage as well: which geometric shape usually signals a warning or hazard rather than direction or information?

✅ Before You Answer

• Be sure you can mentally picture the white buoy with orange markings that carries the word "DANGER"—note its geometric symbol. • Confirm which shapes in the figure are typically used for lateral daybeacons (port and starboard) so you do not confuse direction marks with danger marks. • Before choosing, verify that your choice is a warning symbol, not one used only for information or for channel boundaries.