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100+ Free SAMSA Deck Officer Class 4 Near-Coastal Certificate of Competency Practice Questions
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Key Facts: SAMSA Deck Officer Class 4 Near-Coastal Certificate of Competency Exam
100
Practice Questions
Study Adaptation
3 hours
Time Limit
SAMSA Syllabus
60%
Passing Mark
SAMSA Standard
Region A
IALA Buoyage System
South African Waters
Our 100 MCQs are an English-language MCQ study adaptation for SAMSA examinations. The SAMSA Deck Officer Class 4 Near-Coastal Certificate of Competency exam tests core competency across near-coastal navigation and chartwork (~30%), COLREGs 1972 collision avoidance rules (~30%), coastal vessel stability and seamanship (~20%), and maritime safety, emergency response, and SAMSA regulations (~20%).
Sample SAMSA Deck Officer Class 4 Near-Coastal Certificate of Competency Practice Questions
Try these sample questions to test your SAMSA Deck Officer Class 4 Near-Coastal Certificate of Competency exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1On a standard Mercator nautical chart, how is distance measured correctly?
A.Using the latitude scale at the sides of the chart at the same latitude as the area being measured
B.Using the longitude scale at the top or bottom of the chart
C.Using the scale bar in kilometers shown in the chart title block
D.Using the latitude scale at the extreme north boundary of the chart only
Explanation: On a Mercator projection chart, one minute of latitude equals one nautical mile. Because latitude distortion increases as latitude increases away from the equator, distance measurements must always be taken from the latitude scale adjacent to the area being measured. Measuring against the longitude scale or an unadjusted latitude scale produces significant distance errors.
2A vessel's magnetic compass reads 085°C. Magnetic variation for the location is 20°W and compass deviation on this heading is 3°E. What is the True Course?
A.108°T
B.068°T
C.062°T
D.102°T
Explanation: Using the standard compass conversion rule (Compass to True: 'East is Least, West is Best' or C + Dev = M, M + Var = T): Compass Heading = 085°C. Deviation = 3°E (+3°), giving Magnetic Heading = 088°M. Variation = 20°W (-20°), giving True Heading = 068°T.
3Which ocean current flows south-westward along the east and south coasts of South Africa, exerting a significant influence on coastal navigation?
A.Benguela Current
B.Mozambique Current
C.Agulhas Current
D.South Atlantic Drift
Explanation: The Agulhas Current is a strong, warm ocean current that flows south-westward along the east and south coast of South Africa. It can reach speeds exceeding 4 to 5 knots and frequently interacts with south-westerly gales to create dangerous, steep freak waves off the South African coast.
4Under the IALA Maritime Buoyage System Region A (used in South Africa), what is the color and topmark of a Port Hand Lateral Mark when entering a harbor?
A.Green cylinder with a single green cone topmark pointing up
B.Green conical buoy with a green cone topmark pointing up
C.Red and white vertically striped buoy with a single red sphere topmark
D.Red cylindrical (can) buoy with a single red cylindrical topmark
Explanation: In IALA Region A (which includes South Africa, Europe, Africa, Australia, and Asia), Port Hand marks are red in color, cylindrical (can) in shape, and carry a red cylindrical topmark. When entering a port or harbor from seaward, port hand marks must be kept to the vessel's port side ('Red to Red when returning to port').
5What does a cocked hat (triangle of error) formed by three visual bearings on a paper chart indicate?
A.Random errors exist in the bearings or chart plotting, and the vessel's true position lies within or near the triangle
B.The exact position of the vessel is at the geometric center of the triangle
C.The gyrocompass has a zero error
D.The vessel is experiencing a strong leeway that invalidates the fix
Explanation: A cocked hat occurs when three position lines do not intersect at a single point due to small observation, compass, or plotting errors. The vessel's actual position is generally assumed to be inside or close to the triangle, and prudent navigators treat the position closest to any nearby hazard as the vessel's location for safety.
6What is the primary difference between a Dead Reckoning (DR) position and an Estimated Position (EP)?
A.A DR position includes GPS coordinates while an EP is determined by radar only
B.A DR position accounts only for course steered and speed through the water, whereas an EP also incorporates estimated wind leeway and tidal stream effects
C.An EP is obtained from visual bearings while a DR position is obtained from celestial navigation
D.A DR position is plotted forward in time while an EP can only be plotted retrospectively
Explanation: A Dead Reckoning (DR) position is calculated purely using the vessel's ordered course steered and engine speed over time from a known starting point. An Estimated Position (EP) improves on the DR by applying estimated external forces, specifically wind leeway and tidal stream / current vectors.
7Which light characteristic and color are associated with an IALA North Cardinal Mark?
A.Quick flashing red light
B.Group flashing (3) white light every 10 seconds
C.Continuous quick or very quick flashing white light
D.Isophase white light with 6-second period
Explanation: An IALA North Cardinal mark is painted black on top and yellow below, with two black cone topmarks both pointing upward. Its light characteristic is a continuous quick (Q) or very quick (VQ) flashing white light, symbolizing 12 o'clock on a clock face.
8A vessel observes a lighthouse with a listed height of 45 meters above Mean High Water Springs (MHWS). The echo sounder reads 15 meters below the keel. If the height of tide is currently 1.5 meters below MHWS, what is the vertical clearance to the light above the actual water level?
A.43.5 meters
B.30.0 meters
C.60.0 meters
D.46.5 meters
Explanation: Lighthouse heights on nautical charts are given above Mean High Water Springs (MHWS). If the water level is currently 1.5 m below MHWS, the actual water level is lower than MHWS by 1.5 m. Therefore, the physical clearance/height of the lighthouse focal plane above the current water surface is 45.0 m + 1.5 m = 46.5 meters.
9According to the Rule of Twelfths for semi-diurnal tides, what proportion of the total range of tide rises or falls during the third hour after High Water or Low Water?
A.3/12 of the range
B.2/12 of the range
C.1/12 of the range
D.6/12 of the range
Explanation: The Rule of Twelfths approximates tidal rise/fall over 6 hourly intervals between Low Water and High Water as follows: 1st hour = 1/12, 2nd hour = 2/12, 3rd hour = 3/12, 4th hour = 3/12, 5th hour = 2/12, 6th hour = 1/12. Thus, during the 3rd hour, the tide rises or falls by 3/12 (or 1/4) of the total range.
10What is the primary function of an AIS (Automatic Identification System) Search and Rescue Transmitter (AIS-SART)?
A.To transmit satellite signals on 406 MHz to COSPAS-SARSAT ground stations
B.To transmit locate messages containing GPS coordinates via AIS Channels 1 and 2 to nearby vessel AIS receivers
C.To display a series of 12 dots radiating outward on a 3 cm X-band marine radar display
D.To broadcast automatic MAYDAY voice messages on VHF Channel 16
Explanation: An AIS-SART transmits distress position reports using standard AIS VHF channels (161.975 MHz and 162.025 MHz) containing built-in GPS location data. Nearby vessels equipped with AIS receive the distress symbol and updated position coordinates directly on their ECDIS or radar display.
About the SAMSA Deck Officer Class 4 Near-Coastal Certificate of Competency Practice Questions
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