1.2 Shipboard Organization, Ranks & Trainee GP Rating Duties

1.2 Shipboard Organization, Ranks & Trainee GP Rating Duties

A merchant vessel operates as a self-contained, independent community isolated at sea for weeks at a time. Safe navigation, commercial cargo handling, machinery operation, and personal survival depend entirely on disciplined adherence to a strict maritime chain of command. The General Purpose (GP) Rating training curriculum, established under the authority of the Directorate General of Shipping (DG Shipping), Ministry of Ports, Shipping and Waterways, Government of India, prepares Indian seafarers to work effectively across both the Deck and Engine departments. Trainee GP Ratings must thoroughly understand the departmental rank hierarchy, the roles of shipboard officers and petty officers, their specific maintenance and watchkeeping responsibilities, statutory documentation, and mandatory maritime safety codes.

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1. Shipboard Organizational Hierarchy and Departments

A commercial merchant ship's crew is divided into three distinct operational departments: the Deck Department, the Engine Department, and the Catering Department, all subordinate to the supreme authority of the Master.

                           +------------------+
                           |  MASTER (CAPTAIN)|
                           +--------+---------+
                                    |
          +-------------------------+-------------------------+
          |                                                   |
+---------+----------+                             +----------+---------+
|   DECK DEPARTMENT  |                             |  ENGINE DEPARTMENT |
|   (Chief Officer)  |                             |   (Chief Engineer) |
+---------+----------+                             +----------+---------+
          |                                                   |
          |-- 2nd Officer (Navigation)                        |-- 2nd Engineer (Maintenance)
          |-- 3rd Officer (Safety/LSA/FFA)                    |-- 3rd Engineer (Boiler/Generators)
          |-- Deck Cadet                                      |-- 4th Engineer (Pumps/Auxiliaries)
          |                                                   |-- Electro-Technical Officer (ETO)
          |-- Bosun (Boatswain - Petty Officer)               |-- Engine Cadet
          |   |-- Able Seafarer Deck (AB)                     |
          |   |-- Ordinary Seaman (OS)                        |-- Fitter / Turner (Petty Officer)
          |   |-- Trainee GP Rating (Deck)                    |-- Motorman / Oiler
          |                                                   |-- Wiper
          +-------------------------+                         |-- Trainee GP Rating (Engine)
                                    |                         +--------------------+
                           +--------+---------+
                           |     CATERING     |
                           |    DEPARTMENT    |
                           |   (Chief Cook)   |
                           |   - Messman      |
                           +------------------+

Command Level

• The Master (Captain): The Master holds supreme operational, administrative, and legal command of the vessel. The Master is the shipowner's legal representative and is ultimately responsible under international maritime conventions (SOLAS, MARPOL, STCW, MLC 2006) and the Merchant Shipping Act 2025 for the safety of life at sea, navigation, cargo integrity, environmental protection, and overall vessel security.

Deck Department

The Deck Department is responsible for navigational watchkeeping, cargo stowage and handling, ship stability, hull maintenance, anchoring, mooring, and life-saving appliance maintenance.

• Chief Officer (First Mate): Head of the Deck Department and second-in-command. Directly manages cargo loading, discharging, and care; calculates ship trim and stability; plans hull maintenance; acts as the designated Ship Safety Officer; and serves as direct supervisor to the deck crew. Watches: typically 0400–0800 and 1600–2000 in port.
• Second Officer (Navigating Officer): Responsible to the Master for passage planning, updating and correcting nautical charts and publications (Notices to Mariners), and maintaining bridge navigational electronic equipment (GPS, ECDIS, radar, gyrocompass). Bridge watchkeeper: 0000–0400 and 1200–1600.
• Third Officer (Safety Officer Assistant): Responsible for the operational readiness and routine maintenance of all Life-Saving Appliances (LSA—lifeboats, liferafts, lifejackets, distress pyrotechnics) and Fire-Fighting Appliances (FFA—fire extinguishers, fire pumps, breathing apparatus, fire dampers). Bridge watchkeeper: 0800–1200 and 2000–2400.
• Deck Cadet: Apprentice officer undergoing structured shipboard training and maintaining a Training Record Book (TRB).
• Bosun (Boatswain): The senior deck rating and petty officer. Acts as the deck crew foreman, receiving daily work orders from the Chief Officer and assigning tasks directly to deck ratings. Supervises deck maintenance and leads the forward mooring station during docking.
• Able Seafarer Deck (AB Deck): Certified deck rating under STCW Regulation II/5. Stands navigational bridge watches as helmsman and lookout; operates mooring winches and deck cranes; executes skilled rigging, wire splicing, and maintenance.
• Ordinary Seaman (OS): Junior deck rating assisting the Bosun and AB in routine cleaning, chipping, painting, and mooring operations.
• Trainee GP Rating (Deck Phase): Multi-skilled rating undergoing sea training, performing routine seamanship, cargo hold cleaning, lookout, and maintenance duties under the direct supervision of the Bosun and senior ratings.

Engine Department

The Engine Department is responsible for the main propulsion diesel engine, electrical power generation, steam generation, auxiliary systems (pumps, purifiers, fresh water evaporators, refrigeration), and workshop repairs.

• Chief Engineer: Head of the Engine Department. Holds overall legal and technical responsibility for the propulsion plant, machinery spaces, electrical distribution, bunkering operations, and strict compliance with MARPOL Annex VI and Annex I regulations.
• Second Engineer (First Assistant Engineer): Responsible for day-to-day engine room operations, preventive maintenance scheduling, main engine running gear overhauls, and direct supervision of all engine room ratings.
• Third Engineer: Responsible for auxiliary diesel generators, marine auxiliary boilers, exhaust gas economizers, steam systems, and fuel oil and lubricating oil centrifugal purifiers.
• Fourth Engineer: Responsible for auxiliary centrifugal and positive displacement pumps, air compressors, oily water separators (OWS), sewage treatment plants (STP), and fresh water generators.
• Electro-Technical Officer (ETO): Certificated officer under STCW Regulation III/6 responsible for high- and low-voltage electrical switchboards, automated power management, programmable logic controllers (PLCs), alarm systems, and bridge electronic navigation communication links.
• Fitter / Engine Petty Officer: Skilled mechanic responsible for lathe work, precision fitting, gas cutting, electric arc welding, pipe fabrication, and assisting in major engine overhauls.
• Motorman / Oiler: Certificated rating assisting the duty engineer during engine room watchkeeping, carrying out manual lubrication, recording machinery temperatures and pressures, and monitoring running equipment.
• Wiper: Entry-level engine rating responsible for cleaning machinery spaces, wiping grease from save-alls, degreasing tank tops, painting piping, and clearing bilge wells.
• Trainee GP Rating (Engine Phase): Assists engineers and fitters during overhauls, cleans filters and strainers, prepares tools, and maintains machinery space hygiene.

Catering Department

• Chief Cook: Holds statutory certification under the Maritime Labour Convention (MLC 2006) Title 3. Responsible for preparing hygienic, balanced, culturally appropriate meals, managing dry and refrigerated provision stores, and maintaining strict galley hygiene.
• General Steward / Messman: Responsible for serving meals in the mess rooms, washing utensils, cleaning accommodation common spaces, and managing crew linen and laundry.

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2. Chain of Command and Reporting Lines for GP Ratings

The hallmark of the General Purpose (GP) Rating is versatility. Unlike traditional ratings who served exclusively on deck or in the engine room, a GP Rating is trained to integrate seamlessly into either department according to operational needs.

• Routine Daily Reporting Lines:
  • When assigned to Deck: The Trainee GP Rating reports directly to the Bosun for daily work assignments. The Bosun reports to the Chief Officer.
  • When assigned to Engine Room: The Trainee GP Rating reports directly to the Second Engineer or the Fitter for task instructions and safety briefs.
• Emergency Situations:
  • During emergencies (Fire, Abandon Ship, Man Overboard), the standard hierarchy yields to the Muster List. Every rating is assigned a specific muster station, survival craft, and emergency duty (e.g., carrying blankets, closing fire dampers, bringing spare SCBA cylinders, or preparing lifeboat painter lines) under the command of the assigned Muster Station Leader.

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3. Specific Day-to-Day Duties of a Trainee GP Rating

Deck Operations

1. Surface Preparation and Paint Maintenance:
   • Chipping away rust scale and failed paint layers down to bare metal using manual chipping hammers, pneumatic needle guns, and mechanical wire brushes.
   • Feathering paint edges and cleaning dust before applying primer coats (zinc chromate, epoxy primer) followed by synthetic marine polyurethane topcoats.
   • Wearing required Personal Protective Equipment (PPE): safety goggles, dust mask, leather gloves, boiler suit, and safety footwear.
2. Greasing and Lubricating Deck Machinery:
   • Applying water-resistant marine lithium grease (EP2) using hand grease guns to grease nipples on cargo crane sheaves, mooring winches, windlasses, roller fairleads, pedestal rollers, hatch cleats, and lifeboat davit wire falls.
   • Wiping off excess grease to prevent dirt accumulation and slip hazards on deck.
3. Cargo Hold Cleaning and Preparation:
   • Washing down cargo holds using high-pressure sea water wash guns (Combi-guns) to remove residues of prior bulk cargoes (such as coal, iron ore, or grain).
   • Rinsing holds with fresh water to remove corrosive salt deposits; scraping stubborn cargo residues; clearing hold bilge strainers and rose boxes (strum boxes).
   • Applying protective lime wash coats to hold bulkheads when loading corrosive cargoes like sulfur.
4. Mooring and Unmooring Operations:
   • Assisting at forward or aft mooring stations during arrival, departure, or shifting berths.
   • Flaking out mooring lines (polypropylene, nylon, wire ropes); passing messenger lines and heaving lines to line-handlers ashore or tugboats.
   • Applying rope stoppers or chain stoppers when transferring a tensioned line from a mooring winch drum to deck bitts/bollards.
   • Crucial Rule: Never stand inside a rope’s bight. Treat the whole mooring deck as a potential snap-back danger area; painted zones cannot show every possible recoil path.
5. Gangway Watchkeeping:
   • Controlling port access in compliance with the International Ship and Port Facility Security (ISPS) Code.
   • Verifying identity badges of all visitors, port workers, surveyors, and crew members; recording entries and exits in the Gangway Logbook.
   • Inspecting bags and packages for unauthorized items; checking crew shore passes.
   • Ensuring the gangway safety net is tautly rigged beneath the gangway ladder to prevent falls into the water or onto the quay.
   • Confirming that a lifebuoy with an attached buoyant lifeline (minimum 30 m) and a self-igniting light is immediately available at the gangway head.
   • Monitoring the gangway angle and draft changes during tidal swings; ensuring mooring lines are fitted with functional rat guards.
6. Bridge Lookout Duty:
   • Keeping a continuous, vigilant lookout by sight and hearing during bridge navigation watches in compliance with Rule 5 of the Collision Regulations (COLREGs) and STCW Code Section A-VIII/2.
   • Maintaining night vision by avoiding bright white lights on the bridge; using red illumination only.
   • Immediately reporting to the Officer of the Watch (OOW) any detected lights, flashing navigational buoys, sound signals, fog signals, crossing vessels, fishing boats, floating debris, ice, or persons in distress.
   • Reporting targets using relative bearings: e.g., "Vessel with red light, two points on the port bow" or "Flashing buoy, broad on starboard beam".

Engine Room Operations

1. Machinery Space Cleanliness and Bilge Housekeeping:
   • Mopping up residual water and wiping oil drips from machinery save-alls, drip trays, and floor plates using absorbent pads and cotton rags.
   • Scrubbing tank tops with emulsifying degreasers to remove oily sludge, eliminating combustible fuel accumulations that pose Class B fire hazards.
   • Clearing engine-room bilge wells and accessible mud-box strainers of cotton rags and debris that could obstruct bilge pumping during flooding.
2. Assisting Maintenance and Overhaul:
   • Transporting heavy spare parts (piston rings, fuel injectors, exhaust valves, cylinder heads) and mechanical tools between the ship's workshop and the engine room floor.
   • Rigging manual chain blocks, lever hoists, and slings onto overhead traveling engine cranes under engineer supervision.
   • Assisting in cleaning cylinder-liner scavenge ports, air cooler matrix fins, and boiler burner tips.
3. Sounding Fuel and Bilge Tanks:
   • Manually taking daily soundings of double bottom fuel oil tanks, diesel oil service/settling tanks, lube oil sump tanks, and bilge wells using a calibrated steel sounding tape and weighted brass sounding rod.
   • Applying water-finding paste (which changes color from golden yellow to bright red upon contact with water) to detect water accumulation at the bottom of fuel tanks, and oil-finding paste to measure dark oils accurately.
   • Recording measured liquid depths in centimeters in the ship's official Sounding Logbook and reporting discrepancies to the Fourth or Second Engineer.
4. Filter and Strainer Servicing:
   • Assisting in isolating, depressurizing, draining, and cleaning fuel oil and lubricating oil duplex basket strainers, sea water chest strainers, and auto-backwash filter elements.

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Preparing for the Supervised Ship or Port Visit

During the course visit, stay with the instructor/host, wear the required PPE and use designated access routes. Observe equipment without operating it or entering restricted spaces unless specifically authorized and supervised.

Identify the windlass and mooring stations, ropes/wires, cargo gear, gangway/pilot ladder, accommodation and flags. In the machinery areas, identify the main engine, shafting, generators, control room, bilges and pumps, and explain each item’s basic purpose. Relate the observed work to safe berthing, cargo handling and engine-room duties.

Write the required visit essay/report, using labelled sketches and clear descriptions of what you actually observed. Complete the practical training record as instructed and be ready to discuss the visit with the external examiner. These observations require the supervised visit; this guide prepares you for it.

4. Statutory Seafarer Documentation in India

To serve legally aboard national and international merchant vessels, Indian seafarers must hold statutory documentation issued or endorsed by the Directorate General of Shipping (DG Shipping) under the Ministry of Ports, Shipping and Waterways.

• Continuous Discharge Certificate (CDC):
  • The official seafarer identity and employment-record document issued by the Shipping Master under the Merchant Shipping (Continuous Discharge Certificate) Rules, 2026.
  • Records vessel name and official/IMO number, tonnage and engine power, rank or capacity, engagement and discharge dates and places, and voyage particulars. The Master signs and seals the service entries; they do not grade the seafarer's character or professional ability.
• INDoS (Indian National Database of Seafarers):
  • A unique, continuous 8-digit alphanumeric identification number (e.g., 06NL1234) assigned centrally by DG Shipping to every candidate entering maritime education in India.
  • Prevents certificate forgery and enables automated digital verification of all training courses, STCW endorsements, medical examinations, and sea service records.
• STCW 2010 Basic Safety Training (BST) Modular Courses: Under the International Convention on Standards of Training, Certification and Watchkeeping for Seafarers (STCW 1978, as amended in 2010, Section A-VI/1), every seafarer must complete four fundamental modular courses:
  1. Personal Survival Techniques (PST): Lifeboat and liferaft boarding, operating hydrostatic release units (HRU), wearing lifejackets and immersion suits, thermal protective aids, cold-water survival techniques.
  2. Fire Prevention and Fire Fighting (FPFF): Fire chemistry, fuel classification (Classes A, B, C, D, F), portable extinguishers (water, foam, dry chemical powder, $CO_2$), fire hoses, nozzles, and using Self-Contained Breathing Apparatus (SCBA).
  3. Elementary First Aid (EFA): Cardiopulmonary Resuscitation (CPR), controlling severe arterial bleeding, applying splints for bone fractures, managing shock, and treating chemical burns.
  4. Personal Safety and Social Responsibilities (PSSR): Shipboard occupational safety, permit-to-work systems, human relationships, environmental pollution prevention, and emergency response procedures.
  • Security Training: Security Training for Seafarers with Designated Security Duties (STSDSD) under STCW Section A-VI/6 and the ISPS Code, covering anti-piracy precautions, stowaway searches, and access control.
• Medical Fitness Certificate:
  • Pre-sea and periodic examinations are conducted by DG Shipping-approved medical examiners under the Merchant Shipping (Medical Examination) Rules, 2026.
  • The examiner assesses fitness for the intended duties, including distance and near vision, colour recognition, visual fields and night vision. Pre-sea entry assessment must be distinguished from the minimum in-service eyesight standards in STCW Table A-I/9.
  • For periodic examinations, the maximum certificate validity is 2 years, reduced to 1 year below age 18 or above age 65. Follow the certificate's actual expiry date and any restrictions; the rules treat pre-sea examinations separately.

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5. Code of Conduct, Drug & Alcohol Policy & Safety Culture

Merchant shipping is an inherently hazardous industry where personal recklessness can endanger the entire vessel and crew.

Drug and Alcohol Policy

• Fitness for Duty: A rating must be fit for assigned watchkeeping, safety, security and environmental duties. Alcohol and drugs can impair judgement and reaction time; do not undertake duties while impaired, and report a fitness concern promptly.
• STCW Limits: Under STCW Code section A-VIII/1, administrations must set an alcohol limit no greater than 0.05% blood alcohol concentration (BAC) or 0.25 mg/l in breath for masters, officers and other seafarers performing designated safety, security or marine environmental duties.
• Company and Flag Rules: Follow the applicable flag-state requirements and the ship's drug and alcohol policy. These may be stricter, including a zero-alcohol rule. The STCW ceiling is not permission to drink before duty. Breaches can lead to disciplinary or statutory action under the applicable procedures; do not assume a single universal penalty.

Respectful Conduct and the 2026 PSSR Competence

Violence and harassment harm people and undermine safe teamwork. Recognize threats, humiliation, bullying, discriminatory abuse, unwanted sexual comments or contact, and sexual assault. Abuse of authority, isolation, fatigue and substance misuse can increase the risk; rank or gender does not excuse harmful conduct.

Treat colleagues respectfully, listen to instructions and resolve disagreements without intimidation. If an incident occurs, protect immediate safety, obtain help and report it through the ship’s designated procedure. Intervene only in a way that does not expose anyone to further danger. Support the affected person by listening without blame, respecting privacy and helping them reach appropriate assistance. These recognition, prevention, response and support skills form part of PSSR training effective from 1 January 2026.

Shipboard Safety Culture and Near-Miss Reporting

• Personal Protective Equipment (PPE): The mandatory baseline kit includes safety helmets (hard hats), safety boots with steel toe-caps and puncture-resistant soles, flame-retardant boiler suits, impact/chemical-resistant gloves, safety glasses, and ear defenders in high-noise engine spaces.
• Stop Work Authority (SWA): Every seafarer, including a trainee GP rating, should stop unsafe work, warn anyone exposed and notify the supervisor under the ship’s safety policy and SMS. Work resumes only after the risk is reassessed and effective controls are confirmed.
• Reporting of Near-Misses: A near-miss is an unplanned event that did not result in injury, illness, or damage, but had the potential to do so (e.g., a heavy spanner dropped from a crane platform that landed on an empty deck). Reporting near-misses allows safety committees to eliminate root causes before serious accidents happen.

6. Personal Health and Shared-Space Hygiene

Shared accommodation allows infections to spread quickly. Maintain personal cleanliness, eat a balanced diet, sleep adequately during rest periods and exercise regularly. Keep work clothes and PPE clean, and dress for the work and climate. Clean and protect minor cuts promptly; report illness or a change in fitness for duty and seek medical advice.

Wash hands with soap and water before handling food, after using the toilet and after handling refuse. Follow the cleaning schedule for cabins, alleyways, toilets, galleys, pantries, mess rooms and provision stores. Clear waste promptly, keep accessways unobstructed and keep food-preparation areas and utensils clean. These routines protect both your health and the crew’s living environment.