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An ordinary seaman (OS) is a member of the deck department of a ship.The position is an apprenticeship to become an able seaman, and has been for centuries.In modern times, an OS is required to work on a ship for a specific amount of time, gaining what is referred to as "sea time".
Depths are measured from the chart datum, which is related to the local sea level. The chart datum varies according to the standard used by each national Hydrographic Office . In general, the trend is towards using lowest astronomical tide (LAT), the lowest tide predicted in the full tidal cycle, but in non-tidal areas and some tidal areas Mean ...
An unlimited master mariner would therefore be allowed to serve as the Captain of a ship any size, of any type, operating anywhere in the world, [5] and it reflects the highest level of professional qualification amongst mariners and deck officers. Master certification/licensing is also given with tonnage restrictions of 500 tonnes.
The captain or master is the ship's highest responsible officer, acting on behalf of the ship's owner. Whether the captain is a member of the deck department or not is a matter of some controversy, and generally depends on the opinion of an individual captain. When a ship has a third mate, the captain does not stand watch.
Emergencies can happen at any time. The officer must be ready at all times to safeguard passengers and crew. [2] After a collision or grounding, the mate must be able to take initial action, perform damage assessment and control, and understand the procedures for rescuing persons from the sea, assisting ships in distress, and responding to any emergency which may arise in port.
Captain of sea and war (Portuguese: capitão de mar e guerra, formerly spelled capitão-de-mar-e-guerra) is a rank in most of the Portuguese-speaking navies, notably those of Portugal and Brazil. The term captain of sea and war, like the modern rank of ship-of-the-line captain in the navies of France, Italy, and Spain, has deep historic roots.
On the ship the second officer is the officer that works under the master, i.e. the captain of the ship, and shoulders the responsibility of checking the functionality of all the navigational equipment, such as the echo-sounder, radar, ECDIS, AIS, and on some vessels even the GMDSS radio equipment; however, recently it has been observed that ...
The general duties for a third assistant engineer (fourth engineer) differ from ship to ship. Generally speaking, third assistant engineers are tasked with controlling the main propulsion systems, water systems, purifiers, air compressors, sewage treatment plant, fresh water generator, actively involving in bunkering operation, record keeping of fuel tanks sounding as instructed by chief ...