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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.
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".
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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.
A map of a sea or ocean area and adjacent coastal regions, intended specifically for navigation at sea. Nautical charts use map projections designed for easy use with hand instruments, such as the Mercator projection , and indicate depths, hazards, landmarks , aids to navigation such as buoys , and ashore facilities of interest to mariners .
In most modern warships, the commanding officer has a main cabin—the in-port cabin, often adjacent to the ship's central control room (operations room)—and a sea cabin adjacent to the bridge. Thus, when likely to be called from sleep or attending to administration, the commanding officer can go to the sea cabin and thereby be able to appear ...
A sample United States Merchant Marine license issued by the United States Coast Guard in 2006 Mariners (Captain, first officer and second officer) at the controls of the Kristina Regina A licensed mariner is a sailor who holds a license from a maritime authority to hold senior officer-level positions aboard ships, boats, and similar vessels.