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USCG Exam Practice · Rule 35 — Sound Signals in Restricted Visibility

In restricted visibility, the last vessel of a tow, if manned, is required to sound which signal?

  1. AOne prolonged blast followed by two short blasts, at intervals of not more than 2 minutes
  2. BOne prolonged blast followed by three short blasts, at intervals of not more than 2 minutes✓ correct
  3. CTwo prolonged blasts in succession, at intervals of not more than 2 minutes
  4. DFour short blasts, at intervals of not more than 2 minutes

Why B is correct

33 CFR §83.35(e) requires the last vessel of a tow, if manned, to sound four blasts in succession — one prolonged followed by three short blasts — at intervals of not more than 2 minutes. This distinguishes the towed vessel from the towing vessel, which sounds one prolonged followed by two short blasts under §83.35(c).

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