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Exam Review
Key Facts: GASM ADB Exam
ADB 10: 10 m
Private Boat Length Category
UAB announcement, 27 January 2026
ADB 24: 24 m
Private Boat Length Category
UAB announcement, 27 January 2026
17 July 2026
New Regulation Took Effect
Antalya Bölge Liman Başkanlığı announcement
Practical training
Part of the ADB Pathway
UAB announcement, 27 January 2026
IALA A
Buoyage System in Turkish Waters
International Association of Marine Aids to Navigation
ADB 10 and ADB 24 are distinct Turkish private-boat certificate categories. The Ministry confirms theoretical education, practical boat training, and an examination. Our English-language MCQs help learners study boating knowledge; they do not demonstrate boat-handling competence. Current category-specific examination counts, timing, fees, and pass marks remain unverified here.
Sample GASM ADB Practice Questions
Try these sample questions to review concepts for the GASM ADB exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1When measuring distance on a standard Mercator nautical chart, which scale must a navigator use to ensure accuracy?
A.The latitude scale on the side borders at the same general latitude as the distance being measured
B.The longitude scale along the top or bottom border of the chart
C.The graphic distance bar measured exclusively at the equator
D.The printed millimeter scale converted using the chart's nominal ratio
Explanation: On a Mercator projection chart, one minute of latitude equals one nautical mile (1,852 meters). Because Mercator distortion expands with increasing distance from the equator, distances must always be measured using the latitude scale at approximately the same latitude as the route being plotted.
2In maritime navigation and Turkish nautical convention, what exact linear distance is defined as one cable length (gomina)?
A.100 meters (0.1 kilometer)
B.185.2 meters (one-tenth of a nautical mile)
C.200 meters (one-fifth of a kilometer)
D.92.6 meters (one-twentieth of a nautical mile)
Explanation: A cable length (gomina in Turkish maritime terminology) is traditionally defined as one-tenth of an international nautical mile. Since one nautical mile is exactly 1,852 meters, one cable equals 185.2 meters.
3Why is the longitude scale on a Mercator projection nautical chart unsuitable for measuring distance in nautical miles?
A.Chart publishers deliberately misalign longitude markings to compensate for magnetic variation
B.Lines of longitude are curved rhumb lines that distort compass bearings
C.Meridians of longitude converge toward the poles, so the linear length of a minute of longitude decreases with latitude
D.One minute of longitude is fixed at 1,000 meters regardless of latitude
Explanation: Meridians of longitude converge at the geographic poles, meaning that one minute of longitude equals one nautical mile only at the equator; at any other latitude, one minute of longitude equals one nautical mile multiplied by the cosine of the latitude. Consequently, only the latitude scale provides a constant 1 nautical mile per minute.
4What is the primary navigational advantage of using a Mercator projection nautical chart for coastal voyage planning?
A.Distances measured anywhere on the chart can be scaled directly with a standard millimeter ruler
B.Great circle routes always appear as straight lines across the chart
C.Landmass surface areas are depicted in exact proportion across all latitudes
D.A straight line drawn between two points represents a line of constant compass bearing (rhumb line)
Explanation: On a Mercator projection chart, a straight line drawn between two coordinates represents a rhumb line (kerte hattı), which crosses all meridians at the same angle. This allows a mariner to steer a single constant compass course between two points.
5What causes magnetic variation (doğal sapma) on a marine magnetic compass?
A.The angular difference between the Earth's Geographic North Pole and Magnetic North Pole
B.The magnetic interference generated by the boat's inboard engine, electrical wiring, and steel hull fittings
C.The tilt of the compass gimbal caused by the vessel rolling in rough seas
D.Atmospheric radio frequency transmissions from coastal VHF broadcast towers
Explanation: Magnetic variation (doğal sapma) is the angular difference between True North (geographic North Pole) and Magnetic North (the Earth's magnetic pole). This value depends entirely on the vessel's geographic position and is printed inside the chart's compass rose.
6What is magnetic deviation (arızi sapma) on a recreational vessel, and where is it documented?
A.The terrestrial magnetic difference recorded on the printed nautical chart compass rose
B.The compass deflection caused by onboard magnetic fields and iron masses, recorded on the vessel's deviation card
C.The error caused by ocean surface currents acting on the ship's hull, recorded in the logbook
D.The electronic error generated by an uncalibrated GPS receiver antenna
Explanation: Magnetic deviation (arızi sapma) is the deflection of the compass needle caused by local magnetic fields produced by the vessel's own engine, electronics, radios, and iron fittings. It varies with the vessel's heading and is recorded on a vessel-specific deviation card (deviasyon tablosu).
7A boat's magnetic steering compass indicates a heading of 085°. The deviation card shows Deviation is 2° West on this heading, and the local chart indicates Variation is 4° East. What is the vessel's True Course (Hakiki Rota)?
A.091°
B.083°
C.087°
D.079°
Explanation: Converting Compass to True follows the CADET rule (Compass to True: Add East, Subtract West). First, Compass Course (085°) - Deviation West (2°) = Magnetic Course (083°). Next, Magnetic Course (083°) + Variation East (4°) = True Course (087°).
8A nautical chart's compass rose printed in 2020 states: 'Var 4°15'E (2020), annual increase 5''. What is the corrected magnetic variation for voyage planning in 2026?
A.5°00'E
B.3°45'E
C.4°20'E
D.4°45'E
Explanation: The time elapsed between 2020 and 2026 is 6 years. With an annual increase of 5' East, the total change is 6 × 5' = 30' East. Adding this to the baseline: 4°15'E + 0°30' = 4°45'E.
9A motor yacht cruises at a constant speed through the water of 8 knots on a steady course. Neglecting current and leeway, what distance will the vessel cover in 45 minutes?
A.6.0 nautical miles
B.5.3 nautical miles
C.7.0 nautical miles
D.4.5 nautical miles
Explanation: Distance equals Speed multiplied by Time (D = S × T). 45 minutes is 0.75 hours (45 / 60). Multiplying 8 knots × 0.75 hours yields exactly 6.0 nautical miles.
10When plotting a position fix using simultaneous visual compass bearings of two charted coastal lighthouses, what angle of intersection between the two bearing lines provides the greatest theoretical accuracy?
A.30°
B.90°
C.180°
D.15°
Explanation: In terrestrial position fixing, an intersection angle of 90° between two lines of position (LOPs) provides the ideal geometry. This right-angle intersection minimizes the ellipse of error created by minor bearing reading errors.
About the GASM ADB Practice Questions
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