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BDOC - NSS QUESTIONS AND ANSWERS 2025
Parts of a Standard Command - .....ANSWER... ✔✔
Command
Reply
Report
Acknowledgement
Commands to Helm - .....ANSWER... ✔✔ Direction
Amount
Course
Commands to Leehelm - .....ANSWER... ✔✔ Engine
desired
Direction
Amount
Revolutions/Pitch
Rudder Angles - .....ANSWER... ✔✔ Standard- 15
degrees
Full- 30 degrees
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Hard- depends
Engine Orders - .....ANSWER... ✔✔ 1/3 - 5kts
2/3 - 10kts
Standard- 15kts
Full- 20kts
Flank- depends
Back Engine Orders - .....ANSWER... ✔✔ 1/3- 5kts
2/3- 10kts
Full- depends
Momentum - .....ANSWER... ✔✔ Momentum= Mass x
Velocity
Inertia - .....ANSWER... ✔✔ Measures the resistance
of the body to changes in motion
Newton's 1st Law - .....ANSWER... ✔✔ An object in
motion tends to stay in motion, an object at rest tends to
stay at rest, unless acted upon by an outside force
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Pivot Points - .....ANSWER... ✔✔ At rest - geometric
center
Ahead bell- 1/3 back from bow
Astern bell- 1/3 forward from stern
Controllable Forces - .....ANSWER... ✔✔ Props
Rudder
Bow/Stern Thrusters
Anchors
Tugs
Mooring Lines
Semi-Controllable Forces - .....ANSWER... ✔✔
Shallow water effects
Back cushion/suction
Passing ship effects
Uncontrollable Forces - .....ANSWER... ✔✔ Wind
Current
Types of Propulsion Plants - .....ANSWER... ✔✔ Gas
Turbine
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Diesel
Steam
Screw Current - .....ANSWER... ✔✔ Suction of current
going into prop
Discharge or rudder flow coming out of prop
Bare Steerageway - .....ANSWER... ✔✔ Minimum
speed at which rudder is still effective
Split Ship Concept - .....ANSWER... ✔✔ Rudder
controls stern
Tug controls bow
Man Overboard Recovery Time - .....ANSWER... ✔✔
6 to 8 minutes
Immediate MOB Actions - .....ANSWER... ✔✔
Rudder/Engine Command
Throw life ring
Pop smoke float
Determine recovery type
BDOC - NSS QUESTIONS AND ANSWERS 2025
Parts of a Standard Command - .....ANSWER... ✔✔
Command
Reply
Report
Acknowledgement
Commands to Helm - .....ANSWER... ✔✔ Direction
Amount
Course
Commands to Leehelm - .....ANSWER... ✔✔ Engine
desired
Direction
Amount
Revolutions/Pitch
Rudder Angles - .....ANSWER... ✔✔ Standard- 15
degrees
Full- 30 degrees
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Hard- depends
Engine Orders - .....ANSWER... ✔✔ 1/3 - 5kts
2/3 - 10kts
Standard- 15kts
Full- 20kts
Flank- depends
Back Engine Orders - .....ANSWER... ✔✔ 1/3- 5kts
2/3- 10kts
Full- depends
Momentum - .....ANSWER... ✔✔ Momentum= Mass x
Velocity
Inertia - .....ANSWER... ✔✔ Measures the resistance
of the body to changes in motion
Newton's 1st Law - .....ANSWER... ✔✔ An object in
motion tends to stay in motion, an object at rest tends to
stay at rest, unless acted upon by an outside force
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Pivot Points - .....ANSWER... ✔✔ At rest - geometric
center
Ahead bell- 1/3 back from bow
Astern bell- 1/3 forward from stern
Controllable Forces - .....ANSWER... ✔✔ Props
Rudder
Bow/Stern Thrusters
Anchors
Tugs
Mooring Lines
Semi-Controllable Forces - .....ANSWER... ✔✔
Shallow water effects
Back cushion/suction
Passing ship effects
Uncontrollable Forces - .....ANSWER... ✔✔ Wind
Current
Types of Propulsion Plants - .....ANSWER... ✔✔ Gas
Turbine
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Diesel
Steam
Screw Current - .....ANSWER... ✔✔ Suction of current
going into prop
Discharge or rudder flow coming out of prop
Bare Steerageway - .....ANSWER... ✔✔ Minimum
speed at which rudder is still effective
Split Ship Concept - .....ANSWER... ✔✔ Rudder
controls stern
Tug controls bow
Man Overboard Recovery Time - .....ANSWER... ✔✔
6 to 8 minutes
Immediate MOB Actions - .....ANSWER... ✔✔
Rudder/Engine Command
Throw life ring
Pop smoke float
Determine recovery type
