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Admiralty Information Overlay

The AIO is a worldwide digital dataset that is designed to be displayed over ENCs in ECDIS and other chart display systems to provide additional information during passage planning. The AIO is refreshed every week, as part of the AVCS Weekly Update and is issued

Anchor work

Anchor Work

Holding Power Knowledge of the type of anchor on your ship is necessary because the holding power of each type is different. The holding power of an anchor is normally expressed in tonnes. The maximum holding power is reached when the anchor starts to drag

ship handling

Turning

Lateral Resistance As a ship commences to turn and thereafter for the duration of a turn, the ship is sliding sideways through the water. This results in a large build up of water resistance which continually opposes the rudder force and we can refer to

effect of wind on ship handling

Effect Of Wind On Ship Handling

Vessel Head to Wind with Headway Vessel making Headway through the water, and Heading directly into the Wind. W is now well forward of amidships, and in fact very close to P; the wind is exerting no turning moment, or sideways force, on the vessel. 

transverse thrust

Transverse Thrust

Ahead Movement of the Propeller The effect of transverse thrust whilst making an ahead movement is arguably less worrying than that of an astern movement, perhaps because the result is less noticeable.  (a) The helical discharge from the propeller creates a larger pressure on the

Lifeboat maintenance

Lifesaving Equipment Maintenance

Life Saving Appliances Maintenance Equipment / Requirement Regulation Ship Type Interval Maintenance By Remark Maintenance and inspection SOLAS II-1/3-9.3 SOLAS III/20.4 SOLAS III/20.7.2 MSC.1/Circ.1331, Annex, para. 4 All Monthly Crew In accordance with manufacturer’s instructions. Maintenance of wires acc. to SOLAS III/20.4. Means of Embarkation

catzoc

CATZOC (Category of Zone of Confidence)

CATZOC on the ENC in simple terms refers to the Quality and Accuracy of survey data and the applicable error in chart datum that sometimes can greatly affect vessel’s UKC calculations.   Zone of Confidence (ZOC) has 6 Categories named A1, A2, B, C, D

oil tanker

Oil Tanker Cargo Tank Atmosphere Control

On a oil tanker the cargo oil tank atmosphere changes as per various operations the ship is performing. These includes the Key Cargo Operations such as:  Discharging  Tank Cleaning  Purging  Gas Freeing  Inerting  Loading   When performing these key cargo operations safely, The most important

Inert gas system

Inert gas System

What is Inert Gas ? It is a gas which contains insufficient Oxygen to support combustion. Keeping tanks inerted means cutting one side of the fire triangle and hence avoiding any chances or Fire or Explosion.  Why do we need Inert Gas ? An Oil

ship handling

Slow Speed Control

Speed Many casualties are proven to occur as a direct result of excessive speed. Its effect can be insidious and a Master may find that he cannot keep up with events, which are happening too quickly. Effective control of the ship is slowly but inexorably