Distress signalsQuestion 282 of 352

Which two letters in the International Code of Signals show distress?

  1. A.B.
  2. S.O.
  3. H.L.
  4. N.C.
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Correct answer: N.C.

The code signal N.C. is a distress signal.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 87: Annex IV: Distress Signals, § 87.01 Need of assistance

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Questions last reviewed: 18 October 2026