BOTH INTERNATIONAL & INLAND Your vessel is 75 meters in length and restricted in her ability to maneuver. Visibility is restricted. What signal do you sound if you are carrying out your work at anchor?

Correct Answer: Option D — One prolonged blast followed by two short blasts on the whistle at intervals of not more than two minutes

Under Inland Rule 34(a), two short blasts indicates 'I intend to leave you on my starboard side' (starboard-to-starboard pass), requiring an identical two short blasts confirmation.