How much sea time is needed to go from OOW to Chief Mate?

STCW Regulation II/2 requires at least 12 months of sea service as an OOW (post-CoC) before applying for the Chief Mate certificate on ships of 3,000 GT or more. Some flag states require additional time or specific voyage types (international voyages, specific cargo sectors).

Can an OOW go straight from OOW to Master without Chief Mate time?

No — STCW Regulation II/2 requires the candidate to hold a Chief Mate CoC and to have at least 36 months of sea service as an OOW, including at least 12 months as Chief Mate, before applying for the Master CoC. The pathway is sequential and cannot be shortcut.

What is HELM Management and why is it required for Chief Mate / Master?

HELM (Human Element, Leadership and Management) at the Management Level is the STCW-mandated leadership and teamwork module for officers at management-level certification (Chief Mate and Master under STCW II/2). It builds on the Operational Level HELM taken for OOW and addresses command-level decision-making, crisis management, and management of resources at sea.

Is Medical Care the same as Medical First Aid?

No — Medical First Aid (STCW A-VI/4-1) is the operational-level course, sufficient for OOW. Medical Care (STCW A-VI/4-2) is the higher qualification required of Masters and officers designated to take charge of medical care. It adds medication administration, surgical skills, and advanced MEDEVAC coordination.

Do I need a Ship Security Officer certificate to become Master?

The Ship Security Officer (SSO) certificate (STCW VI/5) is a mandatory requirement for the designated security officer on board, which is commonly the Master or First Officer. Most flag states require it as a prerequisite for the Master CoC. It covers the ISPS Code, threat assessment, security plans, and drills.

Deck officer pathway — OOW to Chief Mate to Master

The deck officer ladder runs from Officer of the Watch (OOW, STCW II/1) through Chief Mate (or Chief Officer) to Master — all within STCW Chapter II, which governs the master and deck department. Candidates who have completed the cadet-to-OOW pathway (see Cadet to OOW) hold their first Certificate of Competency and begin accumulating the post-CoC sea time required for each senior rank. Senior deck officers lead departments, manage cargo operations, and ultimately assume command with full legal and regulatory responsibility for the ship, crew, cargo, and environment. Typical career duration from OOW CoC to Master CoC is 8–15 years depending on sea-time availability, shipping sector, and flag-state examination frequency.

Progression at each stage

1.Officer of the Watch (OOW)STCW II/1
Certificate
STCW II/1 OOW ≥ 500 GT
Sea time
12 months supervised cadetship (or 36 months as rating forming part of navigational watch) per STCW Reg II/1.2
Additional certificates
BST · AFF · PSCRB · Medical First Aid · GMDSS GOC · ECDIS Operator · Radar/ARPA Operational · HELM Operational (BRM)
Stands a 4-hour solo bridge watch. Typical contracts: 4 on / 2 off or 3 on / 3 off. Entry-level officer appointment.
2.Chief Mate (Chief Officer)STCW II/2
Certificate
STCW II/2 Chief Mate ≥ 3000 GT
Sea time
12 months as OOW (post-CoC) per STCW Reg II/2
Additional certificates
Advanced Fire Fighting (AFF — refresher if due) · Medical Care (VI/4-2) · HELM Management · Ship Handling Simulator (recommended) · Cargo Securing (IMSBC / IMO Model Course)
Second in command. Responsible for cargo planning, stability, deck crew management, and safety management system (SMS) maintenance. Holds the 4–8 watch traditionally and is master's deputy for cargo and safety functions.
3.Master (≥ 3000 GT)STCW II/2
Certificate
STCW II/2 Master ≥ 3000 GT
Sea time
36 months as OOW including at least 12 months as Chief Mate per STCW Reg II/2. Some flag states accept 24 months as Chief Mate as an alternative national provision.
Additional certificates
Ship Security Officer (SSO, VI/5) · HELM Management · Crisis Management & Human Behaviour (V/2 — required for passenger ships) · Polar Code Advanced (V/4-2 — if operating in polar waters)
Final rank in the deck progression. Sole decision-making authority for navigation, cargo, safety, and crew discipline. Master reports to the shipowner / operator and is the company's designated representative on board for ISM Code compliance.

Specialist endorsements acquired along the pathway

· Tanker endorsements — Basic Tanker Familiarisation (oil, chemical, or gas) before joining a tanker; Advanced Tanker (V/1-1-2, V/1-1-3, V/1-2-2) at officer level. Required for all deck officers on tankers.
· Polar Code (V/4-1 Basic, V/4-2 Advanced) — V/4-1 required for OOWs on polar voyages; V/4-2 (Advanced) required for Master and Chief Mate on polar-operating vessels from 2018.
· IGF Code (V/3) — for vessels on low-flashpoint fuels (LNG, methanol). Applicable from the first appointment to an IGF-Code vessel.
· Crowd management / passenger safety (V/2) — required for all officers on passenger ships, including ferries and cruise vessels (see which officers are on a cruise ship).
· Dynamic Positioning (DP) — NI-DPO certification for offshore and DP vessel assignments; not STCW-mandated but commercially essential on DP vessels.

Training routes by country

Philippines (MARINA)
Chief Mate and Master examinations (LEOV II/2 and Master Mariner) are administered by MARINA. Sea-time is documented in the MARINA Discharge Book. Flag-state-specific — verify with marina.gov.ph.
India (DG Shipping)
DG Shipping Class II (Chief Mate) and Class I (Master Mariner) examinations — written (Function papers) and oral (before a DG-appointed surveyor). Flag-state-specific — verify with dgshipping.gov.in.
Ukraine (Maradmin)
State qualifying examinations for Chief Mate and Master CoC at accredited maritime academies. Ukraine is on the IMO White List. War-era considerations apply to document issuance and banking for salary remittance. Flag-state-specific — verify with the Ukrainian Maritime Administration.
United Kingdom (UK MCA)
MCA Chief Mate CoC: Phase 3 college + oral examination. Master (Unlimited) CoC: Phase 4 college + oral. MCA examiners are Flag State-appointed surveyors. Flag-state-specific — verify with gov.uk/MCA.
Norway (Sjøfartsdirektoratet)
Navigatør klasse 2 (Chief Mate equivalent) and Navigatør klasse 1 (Master) issued by the Norwegian Maritime Authority. Flag-state-specific — verify with sdir.no.

Salary ranges

Salaries increase substantially at each rank. Indicative 2025 monthly ranges (basic wage, foreign-going):

· OOW — USD 2,800–5,500 depending on vessel type. Tankers: higher.
· Chief Mate — USD 5,500–9,500 on container / bulk; USD 9,500–12,500 on VLCC tankers.
· Master — USD 9,000–14,000 (container / bulk); USD 14,000–19,000 (VLCC). LNG Masters can exceed USD 20,000/month.

See salary database for full rank × vessel-type × region breakdown.

Revalidation

CoCs under STCW II/2 are valid for five years. Continued competence is demonstrated by 12 months of approved sea service in the previous five years (or 3 months in the previous six months), plus refresher training for time-limited endorsements: AFF, PSCRB/FRB, MEDFA, and all tanker advanced courses have mandatory practical refreshers. See career pathways reference for the full revalidation cycle.

Frequently asked questions

How much sea time is needed to go from OOW to Chief Mate?
STCW Regulation II/2 requires at least 12 months of sea service as an OOW (post-CoC) before applying for the Chief Mate certificate on ships of 3,000 GT or more. Some flag states require additional time or specific voyage types (international voyages, specific cargo sectors).
Can an OOW go straight from OOW to Master without Chief Mate time?
No — STCW Regulation II/2 requires the candidate to hold a Chief Mate CoC and to have at least 36 months of sea service as an OOW, including at least 12 months as Chief Mate, before applying for the Master CoC. The pathway is sequential and cannot be shortcut.
What is HELM Management and why is it required for Chief Mate / Master?
HELM (Human Element, Leadership and Management) at the Management Level is the STCW-mandated leadership and teamwork module for officers at management-level certification (Chief Mate and Master under STCW II/2). It builds on the Operational Level HELM taken for OOW and addresses command-level decision-making, crisis management, and management of resources at sea.
Is Medical Care the same as Medical First Aid?
No — Medical First Aid (STCW A-VI/4-1) is the operational-level course, sufficient for OOW. Medical Care (STCW A-VI/4-2) is the higher qualification required of Masters and officers designated to take charge of medical care. It adds medication administration, surgical skills, and advanced MEDEVAC coordination.
Do I need a Ship Security Officer certificate to become Master?
The Ship Security Officer (SSO) certificate (STCW VI/5) is a mandatory requirement for the designated security officer on board, which is commonly the Master or First Officer. Most flag states require it as a prerequisite for the Master CoC. It covers the ISPS Code, threat assessment, security plans, and drills.

Primary sources

Flag-state caveat: STCW sets the international minimum for deck officer certification. Individual flag administrations may require additional examinations, specific sea-time types, or national course requirements not listed here. Always verify with the issuing flag-state administration.

This page is for information only and does not constitute legal or professional advice. Requirements change — verify with your flag administration before acting.