Third Mate · ONC02 · Deck · Rules of the Road
Stand-On Vessel: Three Decision Phases
Apply Rule 17 from the initial keep-course-and-speed duty through permitted and mandatory avoiding action.
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Third Mate and Third Assistant Engineer USCG License Exam Samples
Third Mate · ONC02 · Deck · Collision Avoidance
Avoiding Action: Early, Substantial and Verifiable
Use Rule 8 to choose positive action that creates safe passing distance without another close-quarters situation.
Third Mate · ONC02 · Deck · Navigation Lights
Sternlight Arc: 67.5° Each Side Astern
Read the navigation-light sectors and distinguish the total sternlight arc from the angle on each side of dead astern.
Third Assistant Engineer · 3AE01 · Engine · Diesel Engine Valve Gear
Diesel Camshafts: Operating Conditions Controlled
Connect cam position and profile to firing order, valve timing and valve lift in a diesel engine.
Third Assistant Engineer · 3AE01 · Engine · Hydraulic Systems
Hydraulic Accumulators: Stored Energy
Recognize pressurized fluid storage as the mechanism that preserves hydraulic energy for later use.
Third Assistant Engineer · 3AE01 · Engine · Electrical Machines
Synchronous Motors: Increasing Hold-In Torque
Relate stronger rotor-field excitation to increased hold-in torque in a synchronous motor.
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Chief Mate and First Assistant Engineer USCG License Upgrade Samples
Chief Mate · ONC01 · Deck · Damage Stability
Damage Stability: Correct the Slack Tank First
Recognize very low effective GM, remove free-surface loss and improve trim after damage forward.
Chief Mate · ONC01 · Deck · Celestial Navigation
Low-Altitude Sun Sights: Refraction Risk
Identify unusual atmospheric refraction as the primary risk when taking Sun sights close to the horizon.
Chief Mate · ONC01 · Deck · Voyage Calculations
Fuel, Speed and Endurance: Square-Law Range
Combine fuel per mile with the speed-squared relationship to estimate remaining vessel range.
First Assistant Engineer · 1AE01 · Engine · Automation and Control
Control Systems: Recognizing Instability
Connect sustained or increasing oscillation to closed-loop control-system instability.
First Assistant Engineer · 1AE01 · Engine · Fresh Water and Instrumentation
Salinity Indication: Why Conductivity Matters
Relate dissolved ions to electrical conductivity and a shipboard salinity indication.
First Assistant Engineer · 1AE01 · Engine · Potable Water Systems
Hydropneumatic Tanks: Recognizing Waterlogging
Connect loss of the compressed-air cushion to short, frequent potable-water pump cycles.
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