Of the four light characteristics shown in...

Question 1 of 2707066636ee928f7522a1c5197e8

Of the four light characteristics shown in illustration D019NG below which one does NOT represent a safe water mark of the IALA Buoyage System?

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Question 1 of 27070

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Of the four light characteristics shown in illustration D019NG below which one does NOT represent a safe water mark of the IALA Buoyage System?

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🔍 Key Concepts

• IALA Safe Water Mark characteristics (shape, color, and light) • Approved light rhythms for Safe Water Marks: Iso, Oc, L Fl 10s, Morse "A" • Difference between Flashing (Fl) and Occulting (Occ) or Long Flashing (L Fl)

💭 Think About

• List the standard light characteristics allowed for a Safe Water Mark under the IALA system, then match each option (A–D) to that list. • Look carefully at option A’s notation: how is Fl (2) different from Occ, L Fl 10s, and Morse "A" in terms of IALA definitions? • Ask yourself: which of these rhythms would you normally associate with lateral or special marks rather than a Safe Water Mark in the middle of safe water?

✅ Before You Answer

• Confirm from your reference that Safe Water Marks use a white light only with specific approved rhythms (Iso, Oc, L Fl 10s, Morse "A"). • Check whether a group-flashing light (Fl (2), Fl (3), etc.) is listed as a valid Safe Water Mark characteristic. • Verify that each of the other three options matches one of the standard Safe Water Mark rhythms before eliminating the odd one out.