ECDIS Flashcards
Advantages of Raster Charts
- Global Coverage
- Familiar
- Fully approved
- Cheap
- Same areas
Disadvantages of Raster Charts
- Cluttered when zoomed out
- Different Scales
- Not Scalable
- No Grounding Alarms
- Not Seamless, has boundaries
Advantages of Vector Charts
- Intelligent can be interrogated
- Seamless & Scalable with no distortion when zooming
- Information layers may be added or removed
- Alarms & Indications
- Ability to monitor own ships Route
- Small file size when updating
Disadvantages of Vector Charts
- Expensive to produce
- Same survey data as paper
- Not all approved data
- Unfamiliar symbols
- Operator error
ECDIS: Alarms!!!
- Crossing safety contour
- Area with Special conditions
- Deviation from route
- Position system failure
- Approach to critical point
- Different Geodetic datum
- Malfunction of ECDIS
ECDIS: Indications!
- Default safety contour
- Information Overscale
- Larger scale ENC available
- Different reference system
- No ENC available
- Customised display
- Route planning across safety contour
- Route planning across specified area
- Crossing a danger in route monitoring mode
- System test failure
ECDIS: RCDS Mode, Alarms!!!
- Deviation from Route
- Approach to mariner entered feature, e.g. area, line
- Position system failure
- Approach to critical point
- Different geodetic datum
- Malfunction of RCDS Mode
ECDIS: RCDS Mode, Indications!
- ECDIS operating in the raster mode
- Larger scale information available, or Overscale
- Larger scale RNC available for the area of the vessel
Base Display
To be permanently shown on the ECDIS Display.
- Coastline (high water)
- Own ships safety contour
- Isolated underwater dangers of depth less than the safety contour which lie within the safe waters defined by the safety contour
- Isolated dangers, which lie within the safe water defined by the safety contour, such as fixed structures, overhead wires, ect.
- Scale, Range & North arrow
- Units of depth & height; and Display mode
Standard Display
- Display Base
- Drying line
- Buoys, beacons, other aids to navigation & fixed structures
- Boundaries of fairways, channels, ect.
- Visual & RADAR conspicuous features
- Prohibited & restricted areas
- Chart scale boundaries
- Indiaction of cautionary notes
- Ship routeing systems & ferry routes
- Archipelagic sea lanes
S52
IHO Approved standard for chart display information
S57
IHO Approved standard for electronic chart data format
S61
IHO standard information for raster charts
RENC
Regional electronic chart coordination centre
RCDS
Raster chart display System
ARCS
Admiralty Raster chart service
AVCS
Admiralty Vector Chart System
SENC
System Electronic Navigation Chart
ECDIS Mandatory Sensors
- GPS
- SPEED LOG
- GYRO
ECDIS Additional Sensors
- RADAR: RADAR Image Overlay (RIO)
- AIS
- ECHO SOUNDER
- VDR (VOYAGE DATA RECORDER)
What is a Safety Contour?
A depth contour that is displayed as a thick line separating safe water from shallow areas.
If not set, it will automatically set at 30m
What is a Safety Depth
The calculated depth of water we can safely navigate in. I.e. Draft+UKC+Squat
All Soundings less than that depth will be BOLD.
DEPTHS greater than the safety depth will be greyed out.