Which instruction denotes adjusting speed on only one side of the vessel?

Which instruction denotes adjusting speed on only one side of the vessel?

• A. All ahead
• B. Neutral
• C. Port/Stbd ahead
• D. All stop

Answer: (C)

The key idea is steering by changing thrust on one side only. When you command Port ahead or Stbd ahead, you’re telling that particular side’s propulsion to move forward, while the other side isn’t commanded to the same speed. That creates a turning moment, allowing the vessel to yaw toward the opposite side as the faster side pushes more strongly. All ahead sends equal forward thrust to both sides, so the ship would maintain a straight course. Neutral sets propulsion to neutral for both sides, not moving the ship. All stop halts movement. So Port/Stbd ahead is the instruction that denotes adjusting speed on only one side, making it the best choice.

The key idea is steering by changing thrust on one side only. When you command Port ahead or Stbd ahead, you’re telling that particular side’s propulsion to move forward, while the other side isn’t commanded to the same speed. That creates a turning moment, allowing the vessel to yaw toward the opposite side as the faster side pushes more strongly.

All ahead sends equal forward thrust to both sides, so the ship would maintain a straight course. Neutral sets propulsion to neutral for both sides, not moving the ship. All stop halts movement. So Port/Stbd ahead is the instruction that denotes adjusting speed on only one side, making it the best choice.