ECDIS

Question 1

Advantages of ECDIS?

Answer 1

-Alarms and indications
-seamless
-layers. All, base, standard
-all orientations available. N up. C up.
-wgs48
-zoom in zoom out
-symbols have attributes

Question 2

Disadvantages of ECDIS?

Answer 2

-Not worldwide
-Expensive.
-time consuming to produce.
-when zooming out, objects merge into eachother.

Question 3

Backup of ECDIS?

Answer 3

-another ECDIS
-paper charts

Question 4

What are the IMO standards for ECDIS?

Answer 4

S52- symbols for display and presentation of ECDIS.

S57- the transfer of data between hydrographic offices and its distribution to manufacturers.

S63- piracy protection, selective access, authentication.
To provide assurance that ENC data has come from an approved source.

Question 5

RCDS?

Answer 5

Raster chart display systems.

Question 6

What’s raster charts for?

Answer 6

-If no ENC is available.
-IMO approved.

Question 7

Advantages of raster charts?

Answer 7

-Familiar,
-Scanned images of official paper chart
-inexpensive to produce

Question 8

Disadvantages of raster charts?

Answer 8

-no alarms, must set up manually
-limited zone options
-large file size
-expensive to correct
-only north up.

Question 9

Back up of raster charts?

Answer 9

Paper charts

Question 10

ECS? Back up is? Is it IMO approved?

Answer 10

-Electronic chart system
-Back up is paper charts
-Not IMO approved.

Question 11

Name some reasons when ECDIS will alarm?

Answer 11

-crossing safety contour
-deviation from route
-position system fault
-approach to critical point
-malfunction of ECDIS
-area of special conditions

Question 12

Name some reasons ECDIS will show an indication?

Answer 12

-system test failure
-route planning across specified area
-route planning across safety contour
-no ENC data available.
-information overscale .

Question 13

Not all ENCs have CATZOC. What are the categories?

Answer 13

Five stars= category A1
4= cat A2
3= cat B
2= cat C
1= cat D

Question 14

ENC base. What does this have on the chart?

Answer 14

Not to be used for navigation!!

-ships safety contour
-indication of underwater dangers less then ships safety contour.
-isolated dangers
-scale

Question 15

ENC standard display, is the minimum display that can be used for planning and monitoring. What else does it have displayed?

Answer 15

-drying lines
-Fixed and floating aids
-boundaries of fairways
-visual features
-chart scale
-indication of cautionary notes

Question 16

What is a ENC custom display?

Answer 16

-Between standard and all displays
-ability to switch off or on various display categories.
-used unwisely can lead to dangerous display where not all important info is displayed.

Question 17

What does ENC all show?

Answer 17

Spot soundings
Sub cables
Pipelines
Ferry routes
Details of isolated dangers
AIDS to navigation

Question 18

What’s SENC?

Answer 18

ENC raw data
ECDIS processes data to format ENC in to ENC or SENC
Some vars pre format ENC and supply SENC.
Enables faster loading.

Question 19

IMO definition of SENC?

Answer 19

The up to date internally computed and stored data that is actually used to create the displayed chart image.