Rules of the Road · Distress Signals
Which of the following sequences correctly summarizes all four fog signals for: (1) power-driven vessel making way, (2) power-driven vessel stopped not making way, (3) NUC underway, and (4) vessel at anchor?
- A(1) 1 prolonged, (2) 2 prolonged, (3) 1 prolonged + 2 short, (4) rapid bell ringing✓ Correct
- B(1) 2 prolonged, (2) 1 prolonged, (3) 1 prolonged + 3 short, (4) rapid bell ringing
- C(1) 1 prolonged, (2) 1 prolonged + 2 short, (3) 2 prolonged, (4) rapid bell ringing
- D(1) 1 prolonged + 2 short, (2) 1 prolonged, (3) 2 prolonged, (4) rapid bell ringing
Explanation
Rule 35(a): power-driven making way = 1 prolonged every 2 min. Rule 35(b): power-driven stopped = 2 prolonged every 2 min. Rule 35(c): NUC (and others) = 1 prolonged + 2 short every 2 min. Rule 35(g): at anchor = rapid bell ringing 5 sec every 1 min. This ordering — one, two, one-two, bell — is the essential fog signal matrix for deck exams.
Authority: 72 COLREGS Rules 35(a), 35(b), 35(c), 35(g)
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