Seafarer documentsCertificates and qualifications
Officer in charge of an engineering watch (STCW III/1)
EOOW
- STCW III/1
- Full entry
- Checked 6 October 2026
- Document type
- Qualification document
- Validity
- As issued; competence shown every 5 years
- Names in other countries
- 57 countries
Contents7
1 What it covers
Certificate of Competency – Officer in Charge of an Engineering Watch / Designated Duty Engineer in Periodically Unmanned Machinery Spaces, 750 kW or more (STCW III/1) certifies competence in the named capacity within the limitations stated on the certificate. It is needed by engineering watch officers and designated duty engineers in periodically unmanned engine rooms, on ships with propulsion machinery of 750 kW or more. Validity: as issued; competence shown every 5 years.1–5
2 What it consists of
The certificate requirements include training in: Basic Safety Training STCW VI/1Proficiency in Survival Craft and Rescue Boats Other Than Fast Rescue Boats STCW VI/2Advanced Fire Fighting STCW VI/3Medical First Aid STCW VI/43,6,7
The standard of competence is set by table A-III/1 of the Code.1–3
3 Validity and renewal
Document validity. The expiry date, if the issuing system sets one, is shown on the document itself. This reference does not calculate personal expiry dates.
Maintaining competence. To continue serving at sea, the holder revalidates the certificate at intervals not exceeding 5 years, showing medical fitness and continued professional competence.4,5
4 Which positions
The need follows from the ship and the duties on board, not from the title of the position. In this reference the document appears in the requirements of these positions:
5 Names in 57 countries
How national systems name this document. The original name is given where the source has it; the English name is our editorial rendering.
Same document
| Country | Name in the issuing country |
|---|---|
| South Africa | Officer in Charge of an Engineering Watch in a manned engine-room or designated duty engineers in a periodically unmanned engine roomIssued by: South African Maritime Safety Authority · source |
| Ukraine | Engineer officer of the watch certificatesource |
| India | Marine Engineer Officer Class IVIssued by: Directorate General of Maritime Administration (DGMA) · source |
| Georgia | Engine OOW 750 kW or moreEngineer officer of the watch 750 kW or moreIssued by: Maritime Transport Agency of Georgia · source |
Related document
| Country | Name in the issuing country |
|---|---|
| Egypt | Third engineerIssued by: Egyptian Authority for Maritime Safety · source |
| Nigeria | OOW UNLIMITEDIssued by: Nigerian Maritime Administration and Safety Agency · source |
| Nigeria | OOW <3000KWOOW <3000 kWIssued by: Nigerian Maritime Administration and Safety Agency · source |
Show all 57 countries
Same document
| Country | Name in the issuing country |
|---|---|
| Romania | Brevet de ofițer mecanicCertificate of Competency – Officer in Charge of an Engineering WatchIssued by: Autoritatea Navală Română · source |
| Estonia | 750 kW ja suurema peamasinate efektiivse koguvõimsusega mootorlaeva vahimehaaniku diplomEngineer Watchkeeping Diploma, motor ship 750 kW or moreIssued by: Transpordiamet · source |
| Indonesia | Sertifikat Ahli Teknika Tingkat IIIMarine Engineer Class III (ATT III)Issued by: Directorate General of Sea Transportation, Ministry of Transportation · source |
| Bulgaria | Engineer Officer of the Watch, ship propulsion over 750 kWsource |
| Peru | Oficial de máquinas de buques con máquinas propulsoras principales de potencia igual o superior a 750 kWEngineer Watch Officer, 750 kW or moreIssued by: Dirección General de Capitanías y Guardacostas · source |
| Philippines | Officer-in-Charge of an Engineering WatchIssued by: Maritime Industry Authority · source |
| Bangladesh | Marine Engineer Officer Class-3 (3rd Engineer Officer) CertificateIssued by: Department of Shipping · source |
| Bangladesh | Marine Engineer Officer Class-5 (Watch Keeping Engineer Officer-Near Coastal Voyage) CertificateIssued by: Department of Shipping · source |
| Poland | oficer mechanik wachtowyCertificate of Competency – Officer in Charge of an Engineering WatchIssued by: Polish maritime administration / competent Maritime Office · source |
| Germany | Technischer Wachoffizier TWOEngineer officer of the watch (TWO)Issued by: BSH · source |
| Lithuania | budinčiojo mechaniko kompetencijos liudijimasCertificate of Competency – Officer in Charge of an Engineering WatchIssued by: Lithuanian Transport Safety Administration · source |
| France | Brevet d'officier chef de quart machineEngineer officer of the watch certificateIssued by: French maritime administration · source |
| Netherlands | Wachtwerktuigkundige alle zeeschepenEngineer officer of the watch all seagoing shipsIssued by: Ministerie van Infrastructuur en Waterstaat / Kiwa Register · source |
| Vietnam | Sỹ quan máyCertificate of Competency – Officer in Charge of an Engineering WatchIssued by: Vietnam Maritime and Waterway Administration; historical issuer Vietnam Maritime Administration · source |
| Portugal | Certificado de competência como oficial de máquinas chefe de quarto numa casa das máquinas de condução atendida ou como oficial de máquinas de serviço numa casa das máquinas de condução desatendida em navios ou embarcações com potência propulsora igual ou superior a 750 kWEngineer officer of the watch 750 kW or moreIssued by: DGRM · source |
| Thailand | Officer in charge of an engineering watch,750kW or moreCertificate of Competency – Officer in charge of an engineering watch,750 kW or moreIssued by: Marine Department · source |
| United Kingdom | Engineer Officer of the Watch, UnlimitedIssued by: Maritime and Coastguard Agency · source |
| Türkiye | Makine zabitiEngineer Officer of the Watch – 750 to less than 3000 kWIssued by: Denizcilik Genel Müdürlüğü, Ministry of Transport and Infrastructure · source |
| Türkiye | Uzakyol vardiya mühendisi/makinistiEngineer Officer of the Watch, UnlimitedIssued by: Denizcilik Genel Müdürlüğü, Ministry of Transport and Infrastructure · source |
| Croatia | časnik stroja odgovoran za stražu u strojarniciCertificate of Competency – Officer in Charge of an Engineering WatchIssued by: Ministry of the Sea, Transport and Infrastructure · source |
| Greece | Δίπλωμα Μηχανικός Γ΄ τάξης Ε.Ν.Merchant Navy Engineer – Class CIssued by: Ministry of Maritime Affairs and Insular Policy · source |
| Algeria | Brevet d’aptitude d’officier chargé de quart à la machine à bord de navires dont l’appareil de propulsion principal a une puissance égale ou supérieure à sept cent cinquante(750) et inférieure à trois mille(3000) kilowattsCertificate of Competency – Engineer Officer of the Watch,750 kW to Under 3,000 kWIssued by: Administration chargée de la marine marchande · source |
| Algeria | Brevet d’aptitude d’officier chargé de quart à la machine à bord de navires dont l’appareil de propulsion principal a une puissance égale ou supérieure à sept cent cinquante(750) kilowattsCertificate of Competency – Engineer Officer of the Watch,750 kW or MoreIssued by: Administration chargée de la marine marchande · source |
| Bahamas | Certificate of Competency – Officer in Charge of an Engineering WatchIssued by: Bahamas Maritime Authority · source |
| Hong Kong | Certificate of Competency (Marine Engineer Officer) Class 3 – CombinedIssued by: Hong Kong Marine Department · source |
| Hong Kong | Certificate of Competency (Marine Engineer Officer) Class 3 – MotorIssued by: Hong Kong Marine Department · source |
| Hong Kong | Certificate of Competency (Marine Engineer Officer) Class 3 – SteamIssued by: Hong Kong Marine Department · source |
| United States | Officer in Charge of an Engineering WatchIssued by: United States Coast Guard, National Maritime Center · source |
| Latvia | sardzes mehāniķisCertificate of Competency – Officer in Charge of an Engineering WatchIssued by: Maritime Administration of Latvia / Latvian Seamen’s Registry · source |
| Myanmar | Marine Engineer Officer Class IIIIssued by: Department of Marine Administration · source |
| Italy | Ufficiale di macchinaEngineer officer of the watchIssued by: Ministero delle Infrastrutture e dei Trasporti / maritime administration · source |
| Finland | VahtikonemestariWatchkeeping engineer officer's certificateIssued by: Traficom · source |
| Australia | Engineer WatchkeeperIssued by: Australian Maritime Safety Authority · source |
| New Zealand | Marine engineer class 3Issued by: Maritime New Zealand · source |
| Argentina | Maquinista NavalMarine EngineerIssued by: Agencia Nacional de Puertos y Navegación; Prefectura Naval Argentina · source |
| Malaysia | Engineering Watchkeeping Officer,750kW or more,Near CoastalCertificate of Competency – Engineering Watchkeeping Officer,750 kW or more, Near CoastalIssued by: Malaysia Marine Department · source |
| Malaysia | Engineering Watchkeeping Officer,750kW or more,UnlimitedCertificate of Competency – Engineering Watchkeeping Officer,750 kW or more, UnlimitedIssued by: Malaysia Marine Department · source |
| Sri Lanka | Certificate of Competency – Officer in charge of an engineering watchIssued by: Merchant Shipping Secretariat / Director General of Merchant Shipping · source |
| Sri Lanka | Certificate of Competency – Officer in charge of an engineering watch,750–3000kW,near coastal voyagesCertificate of Competency – Officer in charge of an engineering watch,750–3,000 kW, near coastal voyagesIssued by: Merchant Shipping Secretariat / Director General of Merchant Shipping · source |
| Colombia | Oficial encargado de la guardia en una cámara de máquinas con dotación permanente y Oficial de máquinas designado para prestar servicio en una cámara de máquinas sin dotación permanente en buques de navegación marítima con potencia propulsora igual o superior a 750 kWOfficer in Charge of an Engineering Watch / Designated Duty Engineer, seagoing ships of 750 kW or moreIssued by: Dirección General Marítima (DIMAR) · source |
| Fiji | Engineer WatchkeeperIssued by: Maritime Safety Authority of Fiji · source |
| Fiji | Engineer Class 3 & Engineer Watchkeeper endorsementEngineer Class 3 with Engineer Watchkeeper EndorsementIssued by: Maritime Safety Authority of Fiji · source |
| Iceland | Yfirmaður vélstjórnarvaktar C/(3.)Engineer Officer of the Watch Certificate C/(3.)Issued by: Samgöngustofa · source |
| Jamaica | OiCEW – Main propulsion power of 750 kW or moreIssued by: Maritime Authority of Jamaica (MAJ) · source |
| Slovenia | častnik strojne straže na ladji s pogonskim strojem z močjo 750 kW ali večEngineer Officer of the Watch, ship 750 kW or moreIssued by: Uprava Republike Slovenije za pomorstvo · source |
| Taiwan | 一等管輪適任證書Certificate of Competency – Engineering Watch Officer, National Class 1Issued by: Maritime and Port Bureau / Ministry of Transportation and Communications · source |
| Taiwan | 二等管輪適任證書Certificate of Competency – Engineering Watch Officer, National Class 2Issued by: Maritime and Port Bureau / Ministry of Transportation and Communications · source |
Related document
| Country | Name in the issuing country |
|---|---|
| Spain | Oficial de Máquinas de Segunda Clase de la Marina MercanteMerchant marine engineer officer 2nd classIssued by: Dirección General de la Marina Mercante · source |
| Spain | Mecánico Naval de la Marina MercanteNaval mechanist, merchant marineIssued by: Dirección General de la Marina Mercante · source |
| Spain | Mecánico Mayor Naval de la Marina MercanteSenior naval mechanist, merchant marineIssued by: Dirección General de la Marina Mercante · source |
| France | Brevet d'officier chef de quart de navire de merDual-purpose officer of the watch certificateIssued by: French maritime administration · source |
| France | Brevet d'officier chef de quart machine limité à200 milles des côtesEngineer officer of the watch certificate, within 200 nautical miles of the coastIssued by: French maritime administration · source |
| Mexico | Maquinista NavalIssued by: SEMAR, Dirección General de Marina Mercante · source |
| Netherlands | Maritiem officierDual-purpose maritime officerIssued by: Ministerie van Infrastructuur en Waterstaat / Kiwa Register · source |
| Portugal | Certificado de competência como oficial de máquinas chefe de quarto em navios ou embarcações com potência propulsora entre 750 kW e 3000 kW, limitados a viagens costeirasEngineer officer of the watch 750–3000 kW, near-coastalIssued by: DGRM · source |
| Ghana | Officer In Charge of An Engineering WatchIssued by: Ghana Maritime Authority · source |
| China | 三管轮Certificate of Competency – Fourth Engineer (三管轮)Issued by: Maritime Safety Administration, Ministry of Transport · source |
| China | 二管轮Certificate of Competency – Third Engineer (二管轮)Issued by: Maritime Safety Administration, Ministry of Transport · source |
| Norway | Certificate of Competency Engineer Officer Class 3Engineer officer Class 3 (M3)Issued by: Norwegian Maritime Authority / Sjøfartsdirektoratet · source |
| Norway | Certificate of Competency Engineer Officer Class 4Engineer officer Class 4 (M4)Issued by: Norwegian Maritime Authority / Sjøfartsdirektoratet · source |
| Denmark | Sønæringsbevis som dual skibsofficerDual-purpose ship officer certificateIssued by: Danish Maritime Authority / Søfartsstyrelsen · source |
| Denmark | Vagthavende maskinmesterWatchkeeping engineer officerIssued by: Danish Maritime Authority / Søfartsstyrelsen · source |
| United States | Second Assistant EngineerIssued by: United States Coast Guard, National Maritime Center · source |
| United States | Third Assistant EngineerIssued by: United States Coast Guard, National Maritime Center · source |
| Belgium | Officier mécanicienEngineer officer certificateIssued by: FPS Mobility and Transport / Scheepvaartcontrole · source |
| Sweden | Maskinbefäl klass IIIEngineer officer Class IIIIssued by: Transportstyrelsen · source |
| Canada | Third-class Engineer, Motor ShipIssued by: Transport Canada Marine Safety and Security · source |
| Canada | Third-class Engineer, SteamshipIssued by: Transport Canada Marine Safety and Security · source |
| Canada | Fourth-class Engineer, Motor ShipIssued by: Transport Canada Marine Safety and Security · source |
| Canada | Fourth-class Engineer, SteamshipIssued by: Transport Canada Marine Safety and Security · source |
| Brazil | Primeiro Oficial de MáquinasFirst Marine Engineer Officer (1 OM)Issued by: Marinha do Brasil, Diretoria de Portos e Costas · source |
| Brazil | Segundo Oficial de MáquinasSecond Marine Engineer Officer (2 OM)Issued by: Marinha do Brasil, Diretoria de Portos e Costas · source |
| Brazil | Oficial Superior de MáquinasSenior Marine Engineer Officer (OSM)Issued by: Marinha do Brasil, Diretoria de Portos e Costas · source |
| Chile | Ingeniero Jefe de MáquinasIssued by: Dirección General del Territorio Marítimo y de Marina Mercante · source |
| Chile | Ingeniero PrimeroIssued by: Dirección General del Territorio Marítimo y de Marina Mercante · source |
| Chile | Ingeniero SegundoIssued by: Dirección General del Territorio Marítimo y de Marina Mercante · source |
| Chile | Ingeniero TerceroIssued by: Dirección General del Territorio Marítimo y de Marina Mercante · source |
| Colombia | Oficial encargado de la guardia en una cámara de máquinas con potencia propulsora inferior a 3000 kW, en viajes próximos a la costaOfficer in Charge of an Engineering Watch, under 3,000 kW, near-coastal voyagesIssued by: Dirección General Marítima (DIMAR) · source |
| Ecuador | Segundo Oficial de MáquinasSecond Engineer Officer (national grade, watch level)Issued by: Dirección Nacional de los Espacios Acuáticos (DIRNEA), Armada del Ecuador · source |
| Ecuador | Tercer Oficial de MáquinasThird Engineer Officer (national grade, watch level)Issued by: Dirección Nacional de los Espacios Acuáticos (DIRNEA), Armada del Ecuador · source |
| Uruguay | Segundo Oficial de Máquinas o Segundo IngenieroOfficer in Charge of an Engineering WatchIssued by: Prefectura Nacional Naval, Dirección Registral y de Marina Mercante (DIRME) · source |
| Uruguay | Segundo Oficial de Máquinas de Combustión InternaOfficer in Charge of an Engineering Watch of Internal Combustion EngineIssued by: Prefectura Nacional Naval, Dirección Registral y de Marina Mercante (DIRME) · source |
| Uruguay | Tercer Oficial de Máquinas o Tercer IngenieroOfficer in Charge of an Engineering WatchIssued by: Prefectura Nacional Naval, Dirección Registral y de Marina Mercante (DIRME) · source |
| Uruguay | Tercer Oficial de Máquinas de Combustión InternaOfficer in Charge of an Engineering Watch of Internal Combustion EngineIssued by: Prefectura Nacional Naval, Dirección Registral y de Marina Mercante (DIRME) · source |
"Related document" is a national document of its own system that relates to this type but is not automatically equal to it.
6
Accepted in the corresponding fishing vessel capacity: Certificate of Competency – Fishing Vessel Engineering Watch Officer / Designated Duty Engineer, 750 kW or more STCW-F II/5-28
7 Frequently asked questions
Who needs the Certificate of Competency – Officer in Charge of an Engineering Watch / Designated Duty Engineer in Periodically Unmanned Machinery Spaces, 750 kW or more?
How long is the Certificate of Competency – Officer in Charge of an Engineering Watch / Designated Duty Engineer in Periodically Unmanned Machinery Spaces, 750 kW or more valid?
The expiry date, if the issuing system sets one, is shown on the document itself. This reference does not calculate personal expiry dates. To continue serving at sea, the holder revalidates the certificate at intervals not exceeding 5 years, showing medical fitness and continued professional competence.4,5
What else is the Certificate of Competency – Officer in Charge of an Engineering Watch / Designated Duty Engineer in Periodically Unmanned Machinery Spaces, 750 kW or more called?
Also known as Certificate of Officer in Charge of an Engineering Watch 750+ kW, EOOW. National names in 57 countries are listed on this page.