ECDIS Flashcards
Advantages of ECDIS?
-Alarms and indications
-seamless
-layers. All, base, standard
-all orientations available. N up. C up.
-wgs48
-zoom in zoom out
-symbols have attributes
Disadvantages of ECDIS?
-Not worldwide
-Expensive.
-time consuming to produce.
-when zooming out, objects merge into eachother.
Backup of ECDIS?
-another ECDIS
-paper charts
What are the IMO standards for ECDIS?
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.
RCDS?
Raster chart display systems.
What’s raster charts for?
-If no ENC is available.
-IMO approved.
Advantages of raster charts?
-Familiar,
-Scanned images of official paper chart
-inexpensive to produce
Disadvantages of raster charts?
-no alarms, must set up manually
-limited zone options
-large file size
-expensive to correct
-only north up.
Back up of raster charts?
Paper charts
ECS? Back up is? Is it IMO approved?
-Electronic chart system
-Back up is paper charts
-Not IMO approved.
Name some reasons when ECDIS will alarm?
-crossing safety contour
-deviation from route
-position system fault
-approach to critical point
-malfunction of ECDIS
-area of special conditions
Name some reasons ECDIS will show an indication?
-system test failure
-route planning across specified area
-route planning across safety contour
-no ENC data available.
-information overscale .
Not all ENCs have CATZOC. What are the categories?
Five stars= category A1
4= cat A2
3= cat B
2= cat C
1= cat D
ENC base. What does this have on the chart?
Not to be used for navigation!!
-ships safety contour
-indication of underwater dangers less then ships safety contour.
-isolated dangers
-scale
ENC standard display, is the minimum display that can be used for planning and monitoring. What else does it have displayed?
-drying lines
-Fixed and floating aids
-boundaries of fairways
-visual features
-chart scale
-indication of cautionary notes
What is a ENC custom display?
-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.
What does ENC all show?
Spot soundings
Sub cables
Pipelines
Ferry routes
Details of isolated dangers
AIDS to navigation
What’s SENC?
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.
IMO definition of SENC?
The up to date internally computed and stored data that is actually used to create the displayed chart image.
