Weekly Notices to Mariners (NtM) are official publications issued by national maritime authorities (like the UK Hydrographic Office or other global equivalents) to inform mariners of any changes or updates in nautical charts, publications, and navigational information. These notices help ensure safe and efficient navigation. Weekly Notices to Mariners are part of ADMIRALITY LIST OF…
CPA (Closest Point of Approach) and TCPA (Time to Closest Point of Approach) are nautical terms used in navigation and collision avoidance to assess the risk of vessels coming too close to each other. These parameters are typically used in conjunction with AIS (Automatic Identification System) and radar systems. They are important for safety at…
Block hold loading and part-loaded conditions are terms used in the context of bulk carriers, which are specialized ships designed to transport bulk cargoes such as grain, coal, ore, and other dry commodities. Block hold loading refers to a loading method in which cargo is loaded in a way that creates a solid block of…
Pelorus is a nautical navigational instrument used for taking bearings and measuring angles between two objects, typically used for navigation and orientation at sea. It consists of a graduated circular disc with a sighting device mounted at its center, and is used to take bearings of celestial bodies or landmarks to determine the ship’s position….
The difference between Stiff ship and Tender ship is Explained in detail in this Post for your reference, The terms “stiff” and “tender” are used to describe a ship’s response to waves and sea conditions. A stiff ship is one that has a relatively small rolling motion in response to waves and sea conditions, while…
Anchor Swinging Circle is the area that a vessel can swing in when anchored. It is determined by the length of the anchor cable and the depth of the water. To draw or calculate the anchor swinging circle, follow these steps: It is important to note that the anchor swinging circle can be affected by…
Trim is the difference between the draughts forward and aft. When the forward and aft draughts are the same the ship is said to be on an even keel. Trim is an important consideration when loading and/or ballasting the ship. A small trim by the stern is desirable as most ships are expected to handle better in a…
The pressure vacuum breaker is fitted to a branch line off the inert gas deck main line. The purpose of the pressure vacuum breaker is to safeguard against over-pressurisation as well as under-pressurisation of the cargo tanks. The pressure vacuum breaker operates normally at a line pressure of 1800 mmWG and a vacuum of 700…
Chart Datum is the plane below which all depths are published on a navigational chart. It is also the plane to which all tidal heights are referred, so by adding the tidal height to the charted depth, the true depth of water is determined. By international agreement, Chart Datum is defined as a level so…
L.O.L.E.R is (Lifting Operations and Lifting Equipment Regulations) S.I. 1998 No. 2307 Lifting Operations and Lifting Equipment Regulations (LOLER) is a set of regulations in the United Kingdom that aim to ensure the safety of lifting equipment and the lifting operations that use it. The regulations apply to a wide range of equipment, including cranes,…
Fire Wallet is a wallet type arrangement (Box shaped, or Cylindrical enclosed container type) usually located near the Entrance of the accommodation of the Ship which contains various Important Plans, Crew list and other Important Information required for Immediate reference in case of Emergency. Contents of a Fire Wallet? Below mentioned are the basic Contents…
Stack weight is the maximum weight that can be borne by the deck, hatch covers or tank top at the corners of a bottom slot near the cell guide. The weight of a container is distributed over the four corner fittings and over the entire area occupied by the container. Where will you find stack…