ASA 118 – Docking Endorsement Practice
Exam Questions and Correct Answers
(Verified Answers) Plus Rationales
Question 1: You are docking a single-screw sailboat with a right-hand
propeller in a tight slip, and you need to pivot the stern to port while
moving astern. What is the most effective way to achieve this using prop
walk?
A. Turn the wheel hard to starboard and apply forward thrust.
B. Turn the wheel hard to port and apply forward thrust.
C. Center the rudder, shift into reverse, and apply moderate astern thrust.
D. Turn the wheel hard to starboard and apply reverse thrust.
CORRECT ANSWER: C. Center the rudder, shift into reverse, and apply
moderate astern thrust.
Rationale: A right-hand propeller walking astern naturally pushes the stern to
port; centering the rudder maximizes this effect without rudder drag
counteracting the pivot.
Question 2: While attempting to dock a vessel with twin engines, the
starboard engine fails to start. How should you compensate for the
asymmetrical thrust when docking bow-first into a strong headwind?
A. Use only the port engine and apply heavy rudder to starboard.
B. Use the port engine at low RPM, keep the rudder centered, and rely on
the wind to keep the bow up.
C. Use the port engine at high RPM and turn the wheel hard to port.
D. Shift into reverse and use the port engine to back down.
CORRECT ANSWER: B. Use the port engine at low RPM, keep the rudder
centered, and rely on the wind to keep the bow up.
Rationale: With only one operating engine, asymmetrical thrust will pull the
boat to one side; keeping thrust low and using the wind's natural tendency to
weathervane the bow into the wind helps maintain a straight course.
Question 3: You are approaching a dock with a strong crosswind blowing
from starboard to port. What is the best angle of approach to maintain
control and minimize leeway?
A. Approach parallel to the dock.
B. Approach with the bow pointing away from the dock.
C. Approach at a steep angle (30-45 degrees) into the wind, bow-first.
D. Approach stern-first to let the wind push the bow away.
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,CORRECT ANSWER: C. Approach at a steep angle (30-45 degrees) into the
wind, bow-first.
Rationale: A steep angle into the wind allows you to use engine thrust to
counteract leeway and gives you the option to turn away if the approach
becomes unstable.
Question 4: When using a forward spring line to pivot a vessel's stern away
from a dock, where should the spring line be led from and to?
A. From the stern cleat on the boat to a dock cleat forward of the boat.
B. From a midship or forward cleat on the boat to a dock cleat aft of the
boat.
C. From the bow cleat to a dock cleat forward of the boat.
D. From the stern cleat to a dock cleat aft of the boat.
CORRECT ANSWER: B. From a midship or forward cleat on the boat to a
dock cleat aft of the boat.
Rationale: A forward spring led aft restricts forward movement; applying
forward thrust pulls the bow in and kicks the stern out.
Question 5: What is the primary purpose of a "breast line" during a
alongside docking maneuver?
A. To prevent the vessel from moving forward or backward.
B. To prevent the vessel from moving away from or toward the dock.
C. To pivot the stern of the vessel away from the dock.
D. To secure the vessel against tidal currents.
CORRECT ANSWER: B. To prevent the vessel from moving away from or
toward the dock.
Rationale: Breast lines run perpendicular to the dock and control lateral
movement, keeping the vessel parallel and at a fixed distance from the pier.
Question 6: You are docking a heavy displacement sailboat in a marina with
a strong following current. What is the safest approach?
A. Approach the dock with the current, using high speed to maintain steerage.
B. Approach the dock against the current, maintaining minimal steerage
speed.
C. Approach the dock beam-to the current to let it slide the boat into the slip.
D. Drop anchor up-current and let the boat drift backward into the slip.
CORRECT ANSWER: B. Approach the dock against the current, maintaining
minimal steerage speed.
Rationale: Approaching against the current provides maximum steering
control and allows the vessel to be stopped quickly by simply idling or shifting
to neutral, as the current acts as a natural brake.
Question 7: When utilizing a bow thruster during a docking maneuver, what
is a critical limitation the operator must remember?
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,A. Bow thrusters are highly effective in heavy seas and high forward speeds.
B. Bow thrusters lose effectiveness and can overheat if the boat has
significant forward or astern way.
C. Bow thrusters automatically disengage when the main engine is shifted into
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, reverse.
D. Bow thrusters only work when the rudder is turned hard over.
CORRECT ANSWER: B. Bow thrusters lose effectiveness and can overheat if
the boat has significant forward or astern way.
Rationale: Thrusters require the boat to be nearly stationary to be effective;
water flow past the thruster tunnel at speed disrupts the thrust and can cause
cavitation or overheating.
Question 8: In a Mediterranean mooring configuration, what is the primary
function of the stern lines?
A. To prevent the vessel from swinging side-to-side.
B. To hold the stern against the dock or quay while the anchor holds the
bow off.
C. To provide primary holding power against wind and current.
D. To act as a spring line to absorb shock loads.
CORRECT ANSWER: B. To hold the stern against the dock or quay while the
anchor holds the bow off.
Rationale: In a Med moor, the anchor and rode provide the primary holding
power to keep the bow offshore, while the stern lines secure the vessel to the
quay and prevent it from swinging.
Question 9: You are backing a single-screw vessel with a left-hand propeller
into a slip. Which way will the stern naturally walk when reverse thrust is
applied?
A. To port.
B. To starboard.
C. It will walk straight back.
D. It will walk to port, then starboard.
CORRECT ANSWER: B. To starboard.
Rationale: A left-hand propeller rotates counter-clockwise in forward; in
reverse, it rotates clockwise, naturally walking the stern to starboard.
Question 10: What is the "paddlewheel effect" in twin-screw vessels?
A. The tendency of a vessel to roll heavily when one engine is throttled up.
B. The lateral thrust generated by a propeller acting like a paddlewheel,
pushing the bow away from the side of the turning propeller.
C. The loss of steering control when both engines are put in reverse.
D. The vibration caused by cavitation at high speeds.
CORRECT ANSWER: B. The lateral thrust generated by a propeller acting like
a paddlewheel, pushing the bow away from the side of the turning propeller.
Rationale: The vertical blades of a propeller push water laterally, creating a
sideways force on the hull that can be used to pivot the vessel in tight spaces.
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Exam Questions and Correct Answers
(Verified Answers) Plus Rationales
Question 1: You are docking a single-screw sailboat with a right-hand
propeller in a tight slip, and you need to pivot the stern to port while
moving astern. What is the most effective way to achieve this using prop
walk?
A. Turn the wheel hard to starboard and apply forward thrust.
B. Turn the wheel hard to port and apply forward thrust.
C. Center the rudder, shift into reverse, and apply moderate astern thrust.
D. Turn the wheel hard to starboard and apply reverse thrust.
CORRECT ANSWER: C. Center the rudder, shift into reverse, and apply
moderate astern thrust.
Rationale: A right-hand propeller walking astern naturally pushes the stern to
port; centering the rudder maximizes this effect without rudder drag
counteracting the pivot.
Question 2: While attempting to dock a vessel with twin engines, the
starboard engine fails to start. How should you compensate for the
asymmetrical thrust when docking bow-first into a strong headwind?
A. Use only the port engine and apply heavy rudder to starboard.
B. Use the port engine at low RPM, keep the rudder centered, and rely on
the wind to keep the bow up.
C. Use the port engine at high RPM and turn the wheel hard to port.
D. Shift into reverse and use the port engine to back down.
CORRECT ANSWER: B. Use the port engine at low RPM, keep the rudder
centered, and rely on the wind to keep the bow up.
Rationale: With only one operating engine, asymmetrical thrust will pull the
boat to one side; keeping thrust low and using the wind's natural tendency to
weathervane the bow into the wind helps maintain a straight course.
Question 3: You are approaching a dock with a strong crosswind blowing
from starboard to port. What is the best angle of approach to maintain
control and minimize leeway?
A. Approach parallel to the dock.
B. Approach with the bow pointing away from the dock.
C. Approach at a steep angle (30-45 degrees) into the wind, bow-first.
D. Approach stern-first to let the wind push the bow away.
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,CORRECT ANSWER: C. Approach at a steep angle (30-45 degrees) into the
wind, bow-first.
Rationale: A steep angle into the wind allows you to use engine thrust to
counteract leeway and gives you the option to turn away if the approach
becomes unstable.
Question 4: When using a forward spring line to pivot a vessel's stern away
from a dock, where should the spring line be led from and to?
A. From the stern cleat on the boat to a dock cleat forward of the boat.
B. From a midship or forward cleat on the boat to a dock cleat aft of the
boat.
C. From the bow cleat to a dock cleat forward of the boat.
D. From the stern cleat to a dock cleat aft of the boat.
CORRECT ANSWER: B. From a midship or forward cleat on the boat to a
dock cleat aft of the boat.
Rationale: A forward spring led aft restricts forward movement; applying
forward thrust pulls the bow in and kicks the stern out.
Question 5: What is the primary purpose of a "breast line" during a
alongside docking maneuver?
A. To prevent the vessel from moving forward or backward.
B. To prevent the vessel from moving away from or toward the dock.
C. To pivot the stern of the vessel away from the dock.
D. To secure the vessel against tidal currents.
CORRECT ANSWER: B. To prevent the vessel from moving away from or
toward the dock.
Rationale: Breast lines run perpendicular to the dock and control lateral
movement, keeping the vessel parallel and at a fixed distance from the pier.
Question 6: You are docking a heavy displacement sailboat in a marina with
a strong following current. What is the safest approach?
A. Approach the dock with the current, using high speed to maintain steerage.
B. Approach the dock against the current, maintaining minimal steerage
speed.
C. Approach the dock beam-to the current to let it slide the boat into the slip.
D. Drop anchor up-current and let the boat drift backward into the slip.
CORRECT ANSWER: B. Approach the dock against the current, maintaining
minimal steerage speed.
Rationale: Approaching against the current provides maximum steering
control and allows the vessel to be stopped quickly by simply idling or shifting
to neutral, as the current acts as a natural brake.
Question 7: When utilizing a bow thruster during a docking maneuver, what
is a critical limitation the operator must remember?
Page 2 of 43
,A. Bow thrusters are highly effective in heavy seas and high forward speeds.
B. Bow thrusters lose effectiveness and can overheat if the boat has
significant forward or astern way.
C. Bow thrusters automatically disengage when the main engine is shifted into
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, reverse.
D. Bow thrusters only work when the rudder is turned hard over.
CORRECT ANSWER: B. Bow thrusters lose effectiveness and can overheat if
the boat has significant forward or astern way.
Rationale: Thrusters require the boat to be nearly stationary to be effective;
water flow past the thruster tunnel at speed disrupts the thrust and can cause
cavitation or overheating.
Question 8: In a Mediterranean mooring configuration, what is the primary
function of the stern lines?
A. To prevent the vessel from swinging side-to-side.
B. To hold the stern against the dock or quay while the anchor holds the
bow off.
C. To provide primary holding power against wind and current.
D. To act as a spring line to absorb shock loads.
CORRECT ANSWER: B. To hold the stern against the dock or quay while the
anchor holds the bow off.
Rationale: In a Med moor, the anchor and rode provide the primary holding
power to keep the bow offshore, while the stern lines secure the vessel to the
quay and prevent it from swinging.
Question 9: You are backing a single-screw vessel with a left-hand propeller
into a slip. Which way will the stern naturally walk when reverse thrust is
applied?
A. To port.
B. To starboard.
C. It will walk straight back.
D. It will walk to port, then starboard.
CORRECT ANSWER: B. To starboard.
Rationale: A left-hand propeller rotates counter-clockwise in forward; in
reverse, it rotates clockwise, naturally walking the stern to starboard.
Question 10: What is the "paddlewheel effect" in twin-screw vessels?
A. The tendency of a vessel to roll heavily when one engine is throttled up.
B. The lateral thrust generated by a propeller acting like a paddlewheel,
pushing the bow away from the side of the turning propeller.
C. The loss of steering control when both engines are put in reverse.
D. The vibration caused by cavitation at high speeds.
CORRECT ANSWER: B. The lateral thrust generated by a propeller acting like
a paddlewheel, pushing the bow away from the side of the turning propeller.
Rationale: The vertical blades of a propeller push water laterally, creating a
sideways force on the hull that can be used to pivot the vessel in tight spaces.
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