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Key Facts: GASM Yat Kaptanı (499 GT) Exam
499 GT
Tonnage Limit
Gemiadamları ve Kılavuz Kaptanlar Yönetmeliği
7 Modules
Exam Subject Papers
GASM Tablo-2 Curriculum
50 / 100
Passing Score per Module
Official GASM Examination Guidelines
45-60 min
Time Limit per Module
Computer-Based GASM Exam System
5 Years
Certificate Validity
National Seafarer Licensing Standard
CBT
Delivery Format
GASM Examination Centers
Independent
Study Adaptation
OpenExamPrep Practice Material
The Turkish GASM Yat Kaptanı (499 GT) examination is the statutory certification assessment for captains of commercial and private yachts up to 499 gross tonnage under Turkish maritime regulations (Tablo-2). Administered by GASM via modular computer-based tests, candidates must pass seven subjects: Seyir-Çatışma, Haberleşme, Güvenlik, Gemicilik, Deniz Hukuku, Motor Bilgisi, and Denizcilik İngilizcesi. This question bank offers 100 independent English-language practice questions with step-by-step rationales.
Sample GASM Yat Kaptanı (499 GT) Practice Questions
Try these sample questions to review concepts for the GASM Yat Kaptanı (499 GT) exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1A 42-meter commercial yacht is steered along the Turkish coast. The true course to make good between two waypoints is 074°. The navigational chart shows a magnetic variation of 5° E (2020) with an annual increase of 2' E. For the year 2026, the deviation card for the steering compass on this heading indicates 3° W. What compass course (Cc) should the helmsman steer?
A.072°
B.066°
C.076°
D.082°
Explanation: Variation in 2026 is 5° E + (6 years × 2' E) = 5° 12' E, which rounds to 5° E. Applying the Cadbury rule from True to Compass (Compass = True − East Variation + West Deviation): Magnetic Course = 074° − 5° E = 069°. Compass Course = 069° + 3° W = 072°.
2A yacht master plans a passage across the Rhodes Channel. The desired true track (course made good) is 270° and the yacht's engine speed through the water is 12.0 knots. A steady southerly current sets 000° at 3.0 knots. What true course should be steered to maintain this track, and what will be the resultant speed made good (SMG)?
A.Course to steer 255.5° True, SMG 11.6 knots
B.Course to steer 284.5° True, SMG 12.4 knots
C.Course to steer 270.0° True, SMG 12.0 knots
D.Course to steer 240.0° True, SMG 9.0 knots
Explanation: In the vector triangle, the track vector is 270° and the current vector sets 000° at 3.0 kt. To counteract a northerly current (setting 000°), the vessel must head south of west. The sine of the drift angle is (current speed / yacht speed) × sin(90°) = 3.0 / 12.0 = 0.25, giving an angle of 14.5°. Therefore, course to steer is 270° − 14.5° = 255.5° True. Resulting SMG = sqrt(12.0^2 − 3.0^2) = sqrt(144 − 9) = sqrt(135) ≈ 11.6 knots.
3While navigating off Bodrum on a true course of 180° at a steady speed of 10.0 knots, a yacht master takes an initial true bearing of a lighthouse at 1000 hours, reading 135° True (45° on the port bow). At 1024 hours, the same lighthouse bears 090° True (90° on the port bow). Assuming negligible current and leeway, what is the yacht's distance off the lighthouse at the second bearing (1024 hours)?
A.4.0 nautical miles
B.2.8 nautical miles
C.5.6 nautical miles
D.3.2 nautical miles
Explanation: This is a classic 'doubling the angle on the bow' running fix. The relative bearing doubled from 45° to 90°. In an isosceles right triangle formed by the run and the bearings, the distance run equals the distance off the object when abeam. The run from 1000 to 1024 hours is 24 minutes at 10.0 knots: Distance run = 10.0 × (24 / 60) = 4.0 nautical miles. Thus, the yacht is 4.0 nautical miles off the lighthouse at 1024 hours.
4When measuring nautical distances on a standard Mercator navigational chart, which scale must the navigator use and why?
A.The latitude scale at the same parallel of latitude as the track, because one minute of latitude equals one nautical mile and the scale expands with latitude
B.The longitude scale at the bottom of the chart, because meridians maintain an equal linear distance across the entire globe
C.Any fixed metric scale printed in the chart title block, as Mercator projections preserve true scale universally
D.The latitude scale taken strictly from the equator, to ensure uniform measurements regardless of yacht position
Explanation: On a Mercator projection, meridians are parallel straight lines, causing East-West distortion that increases toward the poles. To preserve conformality (angles), the latitude scale expands by the secant of latitude. Because one minute of latitude corresponds to one nautical mile (1,852 m) on the Earth's surface, distances must always be measured using the latitude scale at the mean latitude of the area being measured.
5A power-driven yacht is underway in open waters. On clear night, the watch officer sights another power-driven vessel on the starboard bow bearing 045° at a range of 5 miles, with compass bearing remaining constant. Under COLREG Rule 15, which action is legally required?
A.The yacht is the give-way vessel and shall keep out of the way, taking early and substantial action to keep well clear, avoiding crossing ahead of the other vessel if circumstances permit
B.The yacht is the stand-on vessel and must maintain her course and speed until the other vessel passes clear
C.Both vessels must alter course to starboard simultaneously to pass port-to-port
D.The yacht must reduce speed immediately and sound one prolonged blast every two minutes
Explanation: Under COLREG Rule 15 (Crossing Situation), when two power-driven vessels are crossing so as to involve risk of collision, the vessel which has the other on her own starboard side is the give-way vessel. She must take early and substantial action to keep well clear and shall, if circumstances admit, avoid crossing ahead of the other vessel.
6Two power-driven vessels are meeting on reciprocal or nearly reciprocal courses in clear daylight so as to involve risk of collision. According to COLREG Rule 14 (Head-on Situation), what action is mandated for each vessel?
A.Each vessel shall alter her course to starboard so that each shall pass on the port side of the other
B.The faster vessel must give way and alter course to port to pass under the stern of the slower vessel
C.The vessel with the wind on her port side shall keep out of the way of the other vessel
D.Each vessel shall maintain course and speed while sounding five short blasts on the whistle
Explanation: COLREG Rule 14 states that when two power-driven vessels are meeting on reciprocal or nearly reciprocal courses so as to involve risk of collision, each shall alter her course to starboard so that each shall pass on the port side of the other.
7Under COLREG Rule 10, what specific restriction applies to a vessel of less than 20 meters in length or a sailing vessel when navigating in the vicinity of an IMO-adopted Traffic Separation Scheme (TSS)?
A.She shall not impede the safe passage of a power-driven vessel following a traffic lane
B.She is prohibited from ever entering any traffic separation lane or separation zone under any circumstances
C.She has absolute right of way over all power-driven vessels within the inshore traffic zone and traffic lanes
D.She may cross traffic lanes at any angle as long as she maintains a speed in excess of 15 knots
Explanation: Rule 10(j) specifies that a vessel of less than 20 meters in length or a sailing vessel shall not impede the safe passage of a power-driven vessel following a traffic lane. While small vessels and sailing yachts may navigate or cross TSS lanes (joining/crossing at right angles to the general flow of traffic under Rule 10(c)), they must never impede vessels following the lane.
8Under COLREG Rule 9 (Narrow Channels), what rule governs the position of a vessel navigating along the course of a narrow channel or fairway?
A.She shall keep as near to the outer limit of the channel or fairway which lies on her starboard side as is safe and practicable
B.She shall navigate in the exact center of the fairway at all times to maximize under-keel clearance
C.She shall favor the port side of the channel to give incoming vessels unimpeded entry
D.She may navigate anywhere across the fairway provided she transmits a safety warning on VHF Channel 16 every 5 minutes
Explanation: COLREG Rule 9(a) requires that a vessel proceeding along the course of a narrow channel or fairway shall keep as near to the outer limit of the channel or fairway which lies on her starboard side as is safe and practicable.
9A 35-meter sailing yacht is proceeding under sail with its diesel auxiliary engine engaged for propulsion during daylight hours. Under COLREG Rule 25(e), what day shape must she exhibit?
A.A conical shape, apex downwards, forward where it can best be seen
B.Two black balls in a vertical line
C.A black diamond shape forward
D.A black cylinder where it can best be seen
Explanation: Under Rule 25(e), a vessel proceeding under sail when also being propelled by machinery shall exhibit forward where it can best be seen a conical shape, apex downwards. Legally, she is considered a power-driven vessel under COLREG Rule 3(c).
10At night, a yacht master observes a vessel exhibiting three all-round red lights in a vertical line in addition to standard masthead lights, sidelights, and a sternlight. What type of vessel is this, and what is the yacht master's obligation toward her under COLREG Rule 18?
A.A vessel constrained by her draft; any vessel other than a vessel not under command or restricted in her ability to maneuver shall, if circumstances admit, avoid impeding her safe passage
B.A vessel engaged in underwater dredging operations; the yacht must pass on the side displaying double green lights
C.A vessel carrying dangerous flammable cargo under Turkish port rules; she has no special privilege in open waters
D.A vessel aground; all approaching yachts must stop immediately and offer towing assistance
Explanation: Three all-round red lights in a vertical line signify a vessel constrained by her draft under Rule 28. Under Rule 18(d)(i), any vessel other than a vessel not under command or restricted in her ability to maneuver shall, if circumstances admit, avoid impeding the safe passage of a vessel constrained by her draft.
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