GMA CoC EOOW common mistakes
GMA CoC EOOW · Understand the traps and how to avoid them.
When asked to take over or hand over an engineering watch, the candidate describes watchkeeping in general terms ('I would check everything is normal') instead of walking through the specific handover checklist: machinery status and running hours, ongoing maintenance and permits, alarms and defects, fuel/water/lube oil levels and transfers in progress, bilge and tank soundings, standing orders, and any machinery under remote or manual control.
Candidates memorise the phrase 'take over the watch' from study notes and never practise reconstructing the actual sequence of checks, so under exam pressure they produce a vague summary rather than a structured checklist.
What to do instead
Build a fixed mental template of six blocks (machinery status, defects/alarms, transfers and levels, maintenance and permits, orders and instructions, documentation) and rehearse listing at least two concrete items per block out loud until it takes under two minutes.
On diesel engine questions the candidate answers with a generic description of the four-stroke cycle and cannot explain why a specific symptom occurs, for example confusing exhaust valve leakage with turbocharger fouling, or attributing high exhaust temperature purely to overload without considering injection timing, scavenge air, or fuel quality.
The underlying thermodynamics and the interaction between scavenge, injection and exhaust are learned as isolated facts, so the candidate cannot link a symptom to a root cause when the question presents a scenario rather than a definition.
What to do instead
For each common symptom (high exhaust temperature, black smoke, low scavenge pressure, high lube oil consumption, crankcase mist) write a one-line causal chain from symptom to component to corrective action, and practise explaining each chain in three sentences.
When a question involves the main engine control or safety system, the candidate cannot distinguish between the alarm, the slow-down and the automatic shut-down, and does not know which parameters trigger which, or how to respond when the engine has already slowed down automatically.
Automation is studied as a list of sensors rather than as a hierarchy of protective actions, so the candidate has no framework for deciding what the system will do and what the engineer must do next.
What to do instead
Learn the protective hierarchy explicitly: alarm only, then slow-down, then shut-down, with two or three named parameters for each (for example high jacket water temperature, low lube oil pressure, overspeed). Practise stating the engineer's action after each automatic intervention, including how to obtain permission before overriding.
Candidates answer boiler and auxiliary system questions without quantifying anything, for example describing a boiler water test as 'check the chemistry' rather than naming the tests (alkalinity, chloride, phosphate, dissolved oxygen, conductivity), the typical limits, and the action for a high chloride result.
Auxiliary systems are treated as background knowledge and revised last, so the candidate remembers the purpose of a treatment regime but not the numbers or the corrective sequence.
What to do instead
Create a one-page table per auxiliary system (boiler water, fuel treatment, compressed air, steering gear hydraulics) with test, limit, consequence of exceedance, and corrective action, and memorise it as a table rather than as prose.
On electrical questions the candidate describes a fault-finding process without any safety discipline: no mention of isolation and lock-off, proving dead, permit to work, or the danger of back-feed from a generator or emergency supply before opening a panel.
Candidates focus on the technical diagnosis because that is what they studied, and treat electrical safety as an assumed preliminary rather than a scored part of the answer.
What to do instead
Make isolation the first sentence of every electrical answer: identify the circuit, isolate, lock and tag, prove dead with a tested instrument, and only then diagnose. Practise until this opening is automatic.
When asked about maintenance or a repair, the candidate jumps straight to the procedure and omits the planning layer: risk assessment, permit to work, isolation, spare parts and tools, competent persons, and the record entry on completion.
Procedural knowledge is over-rehearsed relative to the management of work, and candidates assume the examiner only wants the technical steps.
What to do instead
Structure every maintenance answer as plan, permit, isolate, execute, test, record, restore. State at least one concrete item under each heading, such as the specific isolation points or the specific record book entry.
On stability and damage control questions the candidate confuses free surface effect, list and lash, and cannot explain how a flooded compartment or a partially filled tank changes GM and the danger of a negative GM, or how to correct a list by transferring ballast.
Stability is often studied as formula recall (KM, KG, GM) without linking the formulas to physical shipboard consequences, so the candidate cannot reason about a scenario.
What to do instead
Learn three worked narratives: free surface reducing GM, off-centre flooding causing list, and correcting list by ballast transfer with the associated loss of GM. For each, state the cause, the immediate danger, and the corrective action in order.
On MARPOL and SOLAS questions the candidate gives the general intent of a regulation ('oil must not be discharged') but cannot state the applicable limits, the special areas, the equipment requirements (oil filtering equipment, 15 ppm alarm, oil record book entries) or the survey and certificate validity rules.
Legislation is revised by reading summaries rather than by recalling specific numbers and record-keeping obligations, and candidates assume approximate answers will pass.
What to do instead
Build a fact sheet of numeric limits and record obligations for each annex you are likely to be asked about, and for each one memorise the discharge criterion, the equipment required, and the record book entry. Test yourself by writing the numbers from memory.
In emergency scenarios the candidate lists equipment ('sound the alarm, use the extinguisher') without a command sequence, without establishing communication with the bridge, without accounting for personnel, and without saying how the emergency is escalated or when the fixed system is used.
Emergency procedures are memorised as equipment lists rather than as a decision sequence under time pressure, and the human element of mustering and communication is neglected.
What to do instead
Rehearse each emergency (engine room fire, flooding, blackout, steering failure) as a timed sequence: detect and raise alarm, inform bridge, muster and account for personnel, isolate and contain, escalate, recover and record. Say it aloud in order until the sequence is automatic.
When a question touches on watch records, the oil record book, or communication with the bridge and shore, the candidate treats paperwork as an afterthought and cannot say what is recorded, by whom, when, and why the entry matters for compliance and for the human element on watch.
Administration and human factors are perceived as low-value topics compared with machinery, so candidates never practise articulating them and lose easy marks.
What to do instead
For each record (oil record book, engine log, bunkering documentation, defect and permit records) memorise what is entered, who signs, the time frame, and one compliance or safety consequence of a missing entry. Pair this with a short answer on fatigue, handover communication, and challenge and response.