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Category Archives: Navigation

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

Anchor swinging circle

Monitoring the drag with swing circle A ship at anchor will swing around the anchored position in the wind. A ship at anchor will swing around the anchored position in the wind. It is also recommended to draw a small circle on the chart around

Gyro Compass

The ships main gyro compass gives the heading of the vessel with respect to true north. A Gyro compass is a form of gyroscope, used widely on ships employing an electrically powered, fast spinning gyroscope wheel and frictional forces among other factors utilizing the basic

Magnetic Compass

As per Chapter V of SOLAS 74, as amended, a magnetic compass is a compulsory part of ship borne navigational equipment. This is in addition to the gyro compass & suitably placed repeaters on the ship. This is so primary because of the reliable dependence

course recorder

Course Recorder

It records the Gyro course steered by the vessel continuously against a time scale. The record is considered as useful and vital evidence in case of any accident. The equipment is set at the commencement of a voyage with correct time and then switched on