Which navigational mark may only be lettered?

Question 1 of 2707066636ee928f7522a1c519ccc

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Question 1 of 27070

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Which navigational mark may only be lettered?

🔍 Key Concepts

• Characteristics of lateral marks in the IALA buoyage system • Differences between numbers and letters on buoys and day-shapes • How shape (can, nun, spherical) relates to numbering vs lettering

💭 Think About

• For each option, ask: in practice, have I seen this type of aid with numbers, letters, or a combination? • Consider which type of mark is used more like a unique identifier or special mark, rather than as part of a numbered channel sequence. • Think about whether the marking system on lateral buoys (reds and greens) is primarily numbers or letters in standard charts and on the water.

✅ Before You Answer

• Verify which buoy types in the lateral system are normally numbered rather than lettered. • Check which aids to navigation are commonly used as special or isolated marks and therefore may be lettered only. • Confirm whether a day-shape (a mark on a structure) follows the same numbering/lettering rules as floating buoys.