"Marine Engineers are the members of a ship's crew that operate and maintain the propulsion and other systems onboard the vessel. Marine Engineering staff also deal with the "Hotel" facilities onboard, notably the sewage, lighting, air conditioning and water systems. They deal with bulk fuel transfers, and require training in firefighting and first aid, as well as in dealing with the ship's boats and other nautical tasks especially with cargo loading/discharging gear and safety systems, though the specific cargo discharge function remains the responsibility of deck officers and deck workers.

Sometimes, they are involved in the design and construction of these complicated systems. New design is mostly included within the naval architecture or ship design. The field is closely related to mechanical engineering, although the modern engineer requires knowledge (and hands on experience) with electrical, electronic, pneumatic, hydraulic, chemistry, control engineering, naval architecture, process engineering, gas turbines and even nuclear technology on certain military vessels. The Marine Engineer is a bridge between the people and engineering, hands on no bullshit.

Engine Officers bear the same number of stripes, on cuffs and on epaulettes, as Deck Officers with the complementary rank. For instance, a Chief Engineer bears 4 stripes, as a Captain does, but they are distinguished by the cuffs and epaulettes bearing the Engineer's Blue or purple between the stripes. There is a popular legend that Engineers wear the color purple, granted by the King (royal purple) in honor of the RMS Titanic's Engineers who never abandoned their stations and went down with the ship. But that colorful story is not quite correct, for such an insignia has been worn by Royal Navy engineers at least since 1864. A more probable origin dates back to the 1830s, when Joseph Whitworth invented the method of making truly accurate flat surfaces, by using Engineer's Blue. The method is also used for testing bearing and journal surfaces. It may be this color, that Engineers wear. A different means, of differentiating Engineering officers from Deck officers, is by the insignia above the stripes. In some merchant fleets, a propeller is located above the Engineer's stripes, whilst an anchor or a diamond is located above the Deck officer's stripes.

A ship's crew is divided into two distinct sections: those who navigate the ship and those who maintain the machinery and controls, carrying out all repair functions on-board. The navigators are deck officers and report to the Master (also functionally referred to as Captain), which is a Naval rank. Engineers are running and maintaining all machinery, reporting to the Chief Engineer. Also on board are the crew or 'Ratings', who are 'other ranks' or hands who, though not officers, play a key role in running the ship by assisting the officers in daily operations. In the Engine department, this includes Wiremen (who assist Electrical Officers), Fitters, Motormen (or Donkey Greasers, depending on nomanclature) and Wipers or Utilitymen who play a large role in the daily upkeep of the engine room.

The original term Engineers (on a ship) meant the technical people who dealt with the engines, as opposed to the Consulting Engineer concept (their counterparts on land). Marine Engineers are generally more 'hands on', and often get dirty, sweaty and work in arduous conditions with temperatures in the engine room spaces exceeding 45 - 50 degrees Celsius (122 degrees Fahrenheit). Patience and a logical approach needs to be maintained at all times, especially when dealing with heavy machinery in a seaway. Managing the 'rough' engine-room crew is not a job for the faint hearted !

There are 4 classifications of Marine Engineering licences throughout the Merchant Marine, those being Chief Engineer, First Assistant/Second Engineer, Second Assistant/Third Engineer, and Third Assistant/Fourth Engineer. Those who join without experience are Fifth Engineers / Trainee Marine Engineers (TMEs) or Junior Engineers. Those who join without an engineering licence are given the rank of Engine Cadet. Engine Cadets usually only work under the supervision of a watchkeeping engineer. They are mostly only day workers and are usually given one day off per week to study for gaining their licences. Engine Cadets are generally poorly paid and are often the target for the worst jobs and practical jokes."

by Wikipedia

Perwira Departemen Mesin :
KKM (Kepala Kamar Mesin)/Chief Engineer, pimpinan dan penanggung jawab atas semua mesin yang ada di kapal baik itu mesin induk, mesin bantu, mesin pompa, mesin crane, mesin sekoci, mesin kemudi, mesin freezer, dll.
Masinis 1/First Engineer bertanggung jawab atas mesin induk
Masinis 2/Second Engineer bertanggung jawab atas semua mesin bantu.
Masinis 3/Third Enginer bertanggung jawab atas semua mesin pompa.
Juru Listrik/Electrician bertanggung jawab atas semua mesin yang menggunakan tenaga listrik dan seluruh tenaga cadangan.
Juru minyak/Oiler pembantu para Masinis/Engineer

Ijazah Mesin
Ijazah Mesin dari yang tertinggi adalah:
Ahli Teknik Tingkat I (ATT I) ; dulu Ahli Mesin Kapal C (AMK C): Kepala Kamar Mesin/Chief Engineer kapal tak terbatas
Ahli Teknik Tingkat II (ATT II) ; dulu Ahli Mesin Kapal B (AMK B), dapat menjabat:
Masinis I/Second Engineer kapal tak terbatas
Kepala Kamar Mesin/Chief Engineer dengan tenaga mesin kurang dari 3000 KW, pelayaran tak terbatas
Kepala Kamar Mesin/Chief Engineer dengan tenaga mesin tak terbatas, pelayaran daerah pantai
Ahli Teknik Tingkat III (ATT III) ; dulu Ahli mesin Kapal A (AMK A), dapat menjabat:
Perwira Jaga (tak terbatas)
Masinis I/Second Engineer dengan tenaga mesin kurang dari 3000 KW, pelayaran tak terbatas
Kepala Kamar Mesin/Chief Engineer dengan tenaga mesin kurang dari 3000 KW daerah pantai harus pengalaman 2 tahun sebagai Masinis I
Ahli Teknik Tingkat IV (ATT IV) ; dulu Ahli Mesin Kapal Pelayaran Intersuler (AMKPI): Masinis kapal-kapal antar pulau
Ahli Teknik Tingkat V (ATT V) ; dulu Ahli Mesin Kapal Pelayaran Terbatas (AMKPT): Masinis Kapal-kapal kecil antar pulau
Ahli Teknik Tingkat Dasar (ATT D)