Boating Coach US
Aids to navigationQuestion 244 of 352

As you go in the Conventional Direction of Buoyage, how do the numbers on side marks change?

  1. They get lower
  2. They get higher
  3. They stay the same
  4. They switch to letters
Show answer

Correct answer: They get higher

Numbers rise as you move from the sea toward the head of a waterway.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 62: United States Aids to Navigation System, § 62.43 Numbers and letters

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Questions last reviewed: 18 October 2026