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Category Archives: Navigation


The Global Maritime Distress and Safety System (GMDSS) is an international system relating to all vessels over 300 gross tonnes and all passenger vessels engaged on international voyages, irrespective of tonnage. It provides comprehensive communications for distress, urgency and safety operations in the terrestrial and


Compliance of ECDIS system ECDIS SOFTWARE VERSIONS ECDIS that is not updated to the latest version of the IHO Standards may not meet the chart carriage requirements as set out in SOLAS regulation V/ Below is the list of latest ECDIS software versions available for

Working of Hygrometer & Stevenson’s Screen

Description: A hygrometer is a an easy to use tool for measuring the amount of humidity in the atmosphere and dew point temperature of a parcel of air. The most common type of hygrometer found on board ships is a dry and wet bulb type

Bridge Watchkeeping

Watchkeeping during ocean passages Watchkeeping during ocean passages will require all the activities related to performing a navigational watch as discussed previously. In addition, priority is given to the following Lookout During ocean passages, the principle threat to a vessel is the risk of collision.

ECDIS (Backbone of Bridge)

ELECTRONIC CHARTS There are two types of Electronic Charts available:a) Raster Navigational Charts (RNC).b) Electronic Navigational Charts (ENC). RASTER NAVIGATIONAL CHARTS (RNC) A RNC is a raster chart that conforms to International Hydrographic Organization (IHO) specifications and is produced by digitally scanning a paper chart

Managing Navigational Risks

After studying this blog, you should be able to: State the different categories of navigation in the voyage cycle. Pick out the document that can identify, assess, control and monitor risk in each category of navigation. List out the risks associated with navigation in pilotage

Aneroid Barometer

 An Aneroid barometer is an instrument used for measuring atmospheric pressure. It uses a small flexible material box called a vaccum chamber (capsule), which is made from an alloy of beryllium and copper. The vacuumed capsules are prevented from collapsing by a strong spring. Small

Ice on the Sea

Ice is found at high latitudes in both hemispheres i.e. Northern Hemisphere (Artic) and Southern Hemisphere (Antarctic) regions. They differ greatly because of their physical dissimilarities. The Artic Basin is an area of ocean, which is covered up a thin shell of ice about 3.5

Weather Reporting System

Efficient weather service to shipping depends on the timely location and accurate tracking of weather systems over the open sea, which covers three-quarters of the surface of the earth. Weather is a very important factor in determination of the passage and safe completion. Need for

Anchoring glossary of Terms and abbreviations

  Aframax (tanker) An AFRA (Average Freight Rate Assessment)max is a medium-sized oil tanker which ranges in size between 80,000 and 119,999 deadweight tonnes. Aframax tankers have an average cargo carrying capacity of 750,000 barrels. Anchor Holding Power The holding power of an anchor is