Boating Coach US
Aids to navigationQuestion 236 of 352

What is the main job of a special mark?

  1. To mark the left side of a channel
  2. To warn of rocks in the open sea
  3. To mark a place to tie up
  4. To show a special area or feature on a chart
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Correct answer: To show a special area or feature on a chart

Special marks point out areas that charts explain, such as pipeline areas or military zones. They are not made mainly to guide your route.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 62: United States Aids to Navigation System, § 62.31 Special marks

All questionsPractice the topic "Aids to navigation"

Questions last reviewed: 18 October 2026