KMA Cadet 1st-Stage Exam common mistakes
KMA Cadet 1st-Stage Exam · Understand the traps and how to avoid them.
When a numerical navigation problem gives a course, speed and elapsed time, the candidate computes the distance run but then answers with the rhumb-line bearing to the destination instead of the course actually steered, or reports the final position without applying the drift/distance in the correct direction (e.g. subtracting westerly departure instead of adding it).
Under exam time pressure, candidates pattern-match on the words 'find the course' and grab the bearing formula they memorised, skipping the intermediate step of resolving the run into difference of latitude and departure with an explicit sign convention (N/S, E/W). Sign handling is the single most under-practised sub-skill, so errors hide until the final answer.
What to do instead
Adopt a fixed four-line working layout for every dead-reckoning or course-to-steer question: (1) convert course to a quadrant bearing and write down the N/S and E/W signs before touching a calculator; (2) compute dLat = distance x cos(course) and departure = distance x sin(course); (3) convert departure to dLong using the mid-latitude or Mercator method as the question requires; (4) apply signs to the starting position and sanity-check that the answer moves in the expected compass direction. Practise 20 such problems with the layout until it is automatic.
On stability questions, the candidate calculates GM correctly but then misclassifies the vessel as stiff or tender, or answers a 'will she list and to which side' question using GM instead of the transverse shift of G caused by the weight movement.
Textbook definitions of GM, KG and KM are memorised in isolation, so candidates never build the mental model that a weight shift changes the position of G (and therefore creates a list) without changing GM, whereas adding or removing weight at height changes both. The two effects get conflated under time pressure.
What to do instead
Before calculating, classify the question: is it a weight shift (GG' = w x d / W, GM unchanged, causes list) or a weight addition/removal (changes W, KG and GM)? Write that classification at the top of the answer. Then compute the angle of list from tan(theta) = GG'/GM and check plausibility: a shift of a few tonnes on a large ship should give a small angle. Rehearse one worked example of each type side by side so the distinction is visual, not verbal.
When asked which convention or certificate applies to a given situation, the candidate names a plausible-sounding instrument from memory (e.g. citing SOLAS for oil pollution or MARPOL for crew certification) rather than the instrument that actually governs that subject, and gives no article or annex reference.
The regulatory domain is broad and candidates revise by reading lists of convention titles without attaching each one to its subject matter and its administering body (IMO, ILO, flag State, port State). Titles blur together because they are learned as names rather than as answers to 'what problem does this solve?'
What to do instead
Build a one-page matrix with columns: convention, subject it governs, key annexes/articles, certificate or document issued, who enforces it. Populate rows for SOLAS, MARPOL, MARPOL Annexes I-VI, STCW, MLC 2006, COLREG, LL 1966, TONNAGE 69, BWM, AFS and Salvage 1989. For every practice question, answer in the form 'instrument + annex/article + enforcing authority' and mark yourself wrong if any of the three is missing.
In COLREG questions, the candidate identifies the correct manoeuvring rule but then states the give-way vessel's action without stating the stand-on vessel's obligation, or applies the narrow-channel or traffic-separation-scheme rules to a situation that is actually an open-water crossing.
Rules 11-18 are learned as isolated flashcards, so candidates answer only the part of the rule the question seems to point at. The examiner's mark scheme usually rewards the full picture: who gives way, what the stand-on vessel must do, and which rule set applies in that water.
What to do instead
For every COLREG scenario, answer in a fixed three-part structure: (a) which rule(s) apply and why (state the water type and the relative bearing/aspect); (b) the give-way vessel's specific action; (c) the stand-on vessel's duty to hold course and speed and when she must act. Drill 15 scenarios using this structure and check each against the rule text, not a summary.
On engine and propulsion questions, the candidate describes what a component does in general terms ('the turbocharger increases power') but cannot state the sequence of the four-stroke cycle, the relationship between scavenge air, compression ratio and firing pressure, or why a two-stroke engine needs scavenge ports and a uniflow arrangement.
Engineering topics are revised by reading descriptive text rather than by tracing processes, so candidates hold a vocabulary without a mechanism. When asked 'why' or 'in what order', they have nothing to retrieve.
What to do instead
Draw the cycle from memory on blank paper: for four-stroke, label induction, compression, power, exhaust with valve states and piston position at each; for two-stroke, label scavenge ports, exhaust valve, uniflow scavenge and the timing overlap. Then explain in writing how a fouled turbocharger or a leaking scavenge port changes firing pressure and exhaust temperature. Repeat until you can do it without notes, then answer past-style 'why' questions against the drawing.
In ship construction questions, the candidate confuses longitudinal and transverse framing, or describes a bulkhead, girder or bracket by name without saying what load it carries and how it is connected to adjacent structure.
Structural members are learned from labelled diagrams, so the candidate recognises the picture but cannot reason about the load path. Exams that ask 'why is this member fitted here' or 'what happens if it is wasted' expose the gap.
What to do instead
For each member (keel, keelson, floor, frame, beam, stringer, girder, bracket, pillar, bulkhead), write one sentence on the load it resists and one on how it connects to its neighbours. Then sketch a midship section from memory and trace a load from the bottom shell through floors and girders to the bulkheads. Answer construction questions only in terms of load path and continuity.
On maritime economics and port operations questions, the candidate defines terms such as demurrage, despatch, laytime, freight rate or TEU but cannot apply them to a short scenario, or calculates laytime without excluding excepted periods (Sundays, holidays, weather) stated in the question.
Commercial terms are memorised as definitions, and the arithmetic of laytime is treated as optional detail. Candidates also skim the scenario and miss the words 'weather working day' or 'Sundays and holidays excepted', which change the entire calculation.
What to do instead
Practise ten short laytime statements: write out the laytime allowed, list every excluded period from the clause wording, compute time used, then state whether demurrage or despatch applies and the amount. Underline the clause words in the question before calculating. For definitions, always add a one-line example with actual numbers so the term is tied to use, not just meaning.
On pollution-prevention questions, the candidate states that 'discharging oil is prohibited' without distinguishing the MARPOL Annex I special-area rules, the 15 ppm machinery-space bilge limit, the oil record book requirement, or the circumstances in which a discharge is permitted.
Environmental rules are learned as moral absolutes rather than as a set of conditional permissions with numeric limits and record-keeping duties. The nuance (special areas, 15 ppm, 15 ppm equipment, ORB entries, retention on board) is exactly what is examined.
What to do instead
Make a table for MARPOL Annex I: type of discharge, permitted? , limit, location/special area, equipment required, record book entry. Do the same for Annex IV (sewage) and Annex V (garbage) with their distance-from-land thresholds. Answer pollution questions by quoting the numeric limit and the record-keeping obligation, and mark yourself wrong if either is missing.
In mathematics and physics items, the candidate substitutes numbers into a formula before converting to consistent SI units, so a speed in knots, a mass in tonnes or a pressure in bar enters a calculation that expects m/s, kg or pascals, and the answer is out by a factor of 0.514, 1000 or 100000.
Formula recall is strong but unit discipline is weak, because practice is done with the units already matching. Under exam conditions the candidate reaches for the formula first and the units last, if at all.
What to do instead
Force a unit line into every calculation: before substituting, write each given quantity with its unit and its SI equivalent (1 knot = 0.5144 m/s, 1 tonne = 1000 kg, 1 bar = 100000 Pa, 1 kWh = 3.6 MJ). Carry units through the algebra and check that the result has the expected dimension. Do a final order-of-magnitude check against a known physical value.
On Maritime English and professional communication items, the candidate writes a passage or SMCP message that is grammatically correct but omits the standard phrase structure, or answers a comprehension question with a paraphrase that drops a critical qualifier such as 'not under command', 'restricted in her ability to manoeuvre' or a time and position.
Candidates treat English as a general-language test and write naturally rather than using the Standard Marine Communication Phrases, and they read comprehension passages for gist rather than for the qualifiers that carry operational meaning.
What to do instead
Learn SMCP message patterns as templates (e.g. 'I am/My vessel is ...', 'Advise you ...', 'What is your ...?') and write practice messages using only those patterns. For comprehension, underline every qualifier, number, time and position in the passage before answering, and check that your answer reproduces each one. Have a peer mark whether your message could be misread operationally.