ECDIS - 2nd Mates (FG)- MMD Exam Solved Past Question Papers

Q) Define following as applicable to ECDIS: ENC (Jan-20)

Ans:- Electronic Navigational Chart (ENC) means the database, standardized as to

content, structure and format, issued for use with ECDIS on the authority of

government authorized hydrographic offices. The ENC contains all the chart

information necessary for safe navigation and may contain supplementary

information in addition to that contained in the paper chart (e.g. sailing directions)

which may be considered necessary for safe navigation. Vector charts are an

example.

Q) Define following as applicable to ECDIS: SENC (Jan-20)

Ans:- System Electronic Navigational Chart (SENC) means a database resulting from

the transformation of the ENC (a vector chart) by ECDIS for appropriate use, updates

to the ENC by appropriate means and other data added by the mariner. It is the

database that is actually accessed by ECDIS for the display generation and other

navigational functions and is the equivalent to an up-to-date paper chart. The SENC

may also contain information from other sources.

Q) Define following as applicable to ECDIS: Standard Display (Jan-20)

Ans:- Standard Display means the SENC information that should be shown when a

chart is first displayed on ECDIS. Depending upon the needs of the mariner, the level

of the information it provides for route planning or route monitoring may be modified

by the mariner.

Q) Define following as applicable to ECDIS: Display Base (Jan-20)

Ans:- Display Base means the level of SENC information which cannot be removed

from the display, consisting of information which is required at all times in all

geographic areas and all circumstances. It is not intended to be sufficient for safe

navigation.

Q) Define following as applicable to ECDIS: Vector Chart (Jan-20)

Ans:- A vector chart is a digital database of all the objects (points, lines, areas, etc.)

represented on a chart. Vector charts store information, such as isolated dangers,

depths, depth contours, coastline features, cables and pipelines etc in separate layers

which can be displayed as per the user‟s requirements. Vector charts are also

referred to as intelligent charts as they can be interrogated for information not

displayed but stored in it‟s memory.

Q) Define following as applicable to ECDIS: Raster Chart (Jan-20)

Ans:- Raster Chart data is created by scanning the information on a paper chart and

storing this information in the form of pixels. Many thousands of pixels together make

a flat digital image. Each pixel contains all the data for a particular point: colour,

brightness etc. They are also geographically referenced which makes the raster chart

identical in every way to the paper chart on which it is based. Raster charts cannot be

manipulated or queried. Also referred to as the Raster Chart Display System (RCDS),

the information is contained in one single layer only. Information can only be added

to this type of chart.