Question 951 Rules of the Road

The correct answer is A) One prolonged and two short blasts every two minutes. This is the correct fog signal for a vessel restricted in her ability to maneuver, at anchor, in restricted visibility, as per the International Regulations for Preventing Collisions at Sea (COLREGS) and the Inland Navigation Rules. The other options are incorrect because: B) Two prolonged and two short blasts every two minutes is the signal for a vessel aground, C) Two prolonged and one short blast every two minutes is the signal for a vessel not under command, and D) The rapid ringing of a bell for five seconds every minute is the signal for a vessel at anchor, but does not include the required one prolonged and two short blasts.