ASA 104b Practice Exam Questions With
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. What is the primary purpose of a vessel’s navigation lights?
A. To decorate the boat at night
B. To indicate engine power status
C. To show vessel position, heading, and type to other boats
D. To increase visibility in fog only
Rationale: Navigation lights are internationally required to
communicate a vessel’s status (underway, anchored, fishing), direction
of travel, and type, helping prevent collisions at night or in restricted
visibility.
2. Which action is most important before leaving a dock?
A. Increase throttle quickly
B. Check lines, wind direction, and surrounding traffic
C. Turn on anchor light
D. Drop sails immediately
,Rationale: Safe departure requires situational awareness, proper line
handling, and understanding environmental conditions such as wind
and current.
3. What is the “stand-on” vessel in a crossing situation?
A. The faster vessel
B. The vessel to port
C. The vessel required to maintain course and speed
D. The vessel under power only
Rationale: The stand-on vessel maintains its course and speed while the
give-way vessel alters course to avoid collision.
4. When anchoring, what is the most important factor for holding?
A. Anchor color
B. Proper scope (anchor rode length to depth ratio)
C. Boat speed
D. Wind direction only
Rationale: Adequate scope ensures the anchor sets properly and
maintains holding power under changing wind or current conditions.
5. What does a red buoy typically indicate in U.S. lateral marks?
A. Safe water channel center
B. Hazard zone
,C. Right side of channel when returning from sea (red right returning)
D. Anchorage area
Rationale: Red buoys mark the starboard side of channels when
returning from open water, following the “Red Right Returning” rule.
6. What is the main purpose of a life jacket (PFD)?
A. Increase swimming speed
B. Keep a person afloat and improve survival time in water
C. Provide warmth only
D. Replace swimming ability
Rationale: A PFD increases buoyancy, helping prevent drowning even if
the wearer is unconscious.
7. What should you do if you lose steering while underway?
A. Jump overboard
B. Reduce speed and assess emergency steering options
C. Increase throttle
D. Drop anchor immediately at full speed
Rationale: Slowing the vessel allows control assessment and reduces risk
while implementing backup steering methods.
8. What is “leeway” in sailing?
A. Boat speed over ground
B. Sideways drift caused by wind
, C. Engine thrust loss
D. Anchor drag
Rationale: Leeway is the sideways movement of a vessel caused by wind
pressure on sails or hull.
9. What is the correct response to a MOB (Man Overboard)?
A. Continue sailing and call harbor control
B. Shout “Man Overboard,” maintain visual contact, and begin
recovery maneuver
C. Turn off engine and drift
D. Drop anchor immediately
Rationale: Immediate action with continuous visual contact is critical for
successful recovery.
10. What is the purpose of a fender?
A. Increase speed
B. Protect the hull from impact during docking or rafting
C. Improve sail shape
D. Measure depth
Rationale: Fenders cushion the boat against docks or other vessels to
prevent damage.
11. What does a green buoy indicate?
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of a vessel’s navigation lights?
A. To decorate the boat at night
B. To indicate engine power status
C. To show vessel position, heading, and type to other boats
D. To increase visibility in fog only
Rationale: Navigation lights are internationally required to
communicate a vessel’s status (underway, anchored, fishing), direction
of travel, and type, helping prevent collisions at night or in restricted
visibility.
2. Which action is most important before leaving a dock?
A. Increase throttle quickly
B. Check lines, wind direction, and surrounding traffic
C. Turn on anchor light
D. Drop sails immediately
,Rationale: Safe departure requires situational awareness, proper line
handling, and understanding environmental conditions such as wind
and current.
3. What is the “stand-on” vessel in a crossing situation?
A. The faster vessel
B. The vessel to port
C. The vessel required to maintain course and speed
D. The vessel under power only
Rationale: The stand-on vessel maintains its course and speed while the
give-way vessel alters course to avoid collision.
4. When anchoring, what is the most important factor for holding?
A. Anchor color
B. Proper scope (anchor rode length to depth ratio)
C. Boat speed
D. Wind direction only
Rationale: Adequate scope ensures the anchor sets properly and
maintains holding power under changing wind or current conditions.
5. What does a red buoy typically indicate in U.S. lateral marks?
A. Safe water channel center
B. Hazard zone
,C. Right side of channel when returning from sea (red right returning)
D. Anchorage area
Rationale: Red buoys mark the starboard side of channels when
returning from open water, following the “Red Right Returning” rule.
6. What is the main purpose of a life jacket (PFD)?
A. Increase swimming speed
B. Keep a person afloat and improve survival time in water
C. Provide warmth only
D. Replace swimming ability
Rationale: A PFD increases buoyancy, helping prevent drowning even if
the wearer is unconscious.
7. What should you do if you lose steering while underway?
A. Jump overboard
B. Reduce speed and assess emergency steering options
C. Increase throttle
D. Drop anchor immediately at full speed
Rationale: Slowing the vessel allows control assessment and reduces risk
while implementing backup steering methods.
8. What is “leeway” in sailing?
A. Boat speed over ground
B. Sideways drift caused by wind
, C. Engine thrust loss
D. Anchor drag
Rationale: Leeway is the sideways movement of a vessel caused by wind
pressure on sails or hull.
9. What is the correct response to a MOB (Man Overboard)?
A. Continue sailing and call harbor control
B. Shout “Man Overboard,” maintain visual contact, and begin
recovery maneuver
C. Turn off engine and drift
D. Drop anchor immediately
Rationale: Immediate action with continuous visual contact is critical for
successful recovery.
10. What is the purpose of a fender?
A. Increase speed
B. Protect the hull from impact during docking or rafting
C. Improve sail shape
D. Measure depth
Rationale: Fenders cushion the boat against docks or other vessels to
prevent damage.
11. What does a green buoy indicate?
