Function 1 | Mariners Infogram

Define and state the difference between GMT & GHA and LMT & LHA?

Definition of LMT Local Mean Time (LMT) at any instant is the arc of the equator, or the angle at the pole, measured westerly from the inferior meridian of the…

Mariners Infogram March 16, 2023

Function 1

Difference between ECDIS, ENC & SENC.

ECDIS Electronic Chart Display and Information System (ECDIS) means a navigation information system which, with adequate back-up arrangements, can be accepted as complying with the up-to-date chart required by regulations…

Mariners Infogram March 13, 2023

Function 1

Difference between Collision and Allision.

Collision When two vessels strike each other. Basically, when two moving bodies in water strike or hit or come in contact with each other. Allision Allision occurs when a vessel…

Mariners Infogram March 11, 2023

Function 1

Difference between Grounding, Stranding & Beaching.

Grounding : Grounding is when a ship strikes the seabed unintentionally. It occurs generally through poor navigation and the lack of underkeel clearance. The severity of any damage incurred will…

Mariners Infogram March 5, 2023

Function 1

How will you determine if Risk of Collision exists?

The following methods are to be used while determining if ROC exists: 1) Take compass bearings: This is one of the most important means of determining risk of collision. 2)…

Mariners Infogram March 3, 2023

Function 1

What is the working principle of a shipboard (marine) radar?

Marine radar is an instrument of near perfect synchronisation. Ranges and bearings are obtained by the fact that each component does a specific job at the correct time. Marine radar…

Mariners Infogram October 21, 2022

Function 1

What is Category of zone of confidence?

Category of zone of confidence or the CATZOC are symbols displayed in modern ECDIS and used during the appraisal phase of the passage plan by the OOW to determine the…

Mariners Infogram October 18, 2022

Function 1

What precautions will you take while using a Whirling Physchrometer?

Precautions when using a whirling psychrometer: i) The muslin should be clean and free of dust or deposit left behind by evaporation. If not, the dirt or deposit will not…

Mariners Infogram October 16, 2022

Function 1

What is Hygrometer? What is its principle & precautions during its use

Hygrometer (also called psychrometer) The hygrometer is an instrument for obtaining the relative humidity and/or dew point temperature of air. The type in use at sea on merchant ships is…

Mariners Infogram October 14, 2022

Function 1

Can the wet bulb reading be higher than dry bulb reading in a hygrometer? If yes, how?

Wet bulb reading higher than dry bulb This can happen only under the following circumstances: i) Insufficient evaporation taking place from the wet bulb due to dust, salt or other…

Mariners Infogram October 11, 2022