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OOW Course Study Notes > EDCIS > Flashcards

EDCIS Flashcards

1
Q

What is the 4 primary functions of ECDIS

A
  • Is to contribute to the safe navigation of the vessel.
  • Sound appropriate alarms to assist watch keepers
  • Create a simple and reliable process for updating charts
  • To reduce the workload of the OOW.
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2
Q

Name 6 mandatory alarms required on a full ECDIS system

A
  • Crossing safety contour
  • Deviation from route
  • No ENC area
  • Approach to critical area/point
  • Position system failure
  • See’s a a different geodetic datum
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3
Q

Briefly explain what ECDIS is

A

A type approved Electronic Chart Display and Information System that complies with IMO performance standards.

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4
Q

Briefly explain what ECS is

A

An electronic chart system which is unapproved. It cannot be used as a primary means of navigation.

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5
Q

Briefly explain what RCDS means

A

A Raster Chart Display System displays raster charts. It cannot be used as a Primary means of navigation. Unless there is to ENC available and the master has preformed a risk assessment.

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6
Q

List seven advantages of Vector charts over Raster charts

A
  • Seamless join between charts
  • Safety depth and safety contour can be set and will activate an alarm
  • Chart features can be interrogated
  • Layers can be selected by the user
  • Charts can be rotated to any angle
  • Links are possible to extra information, such as from sailing directions
  • A choice of symbology for buoyage
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7
Q

What are the three mandatory inputs to ECDIS?

A
  • Position (from EPFS)
  • Heading (eg. Gyro)
  • Speed (Log)
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8
Q

Advantages of an ECDIS

A
  • Immediate access to position information
  • Chart can be seen on monitors in multiple helm positions.
  • AIS and Radar over lays can be added to improve spacial awareness for the OOW
  • Quick and easy route planning
  • Automatic log book recording.
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8
Q

What is the S52 performance standard about?

A

S-52 is a standard used by ECDIS manufacturers that determines how ENC data is displayed on an ECDIS screen through symbols, line styles, colours and other visual cues.

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8
Q

What is the S57 performance standard about?

A

S-57 refers to the ENC data format

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8
Q

Explain what is an SENC is

A

A system electronic navigation chart is created when an ECDIS converts an ENC into its own internal SENC format. It is the equivalent of an up-to-date paper chart. ENC conversion to SENC’s are individual to each ECDIS manufacturer. The SENC may also contain other information added by the mariner.

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8
Q

What is meant by SENC?

A

An ECDIS converts an ENC into a SENC (System Electronic Navigation Chart) for processing and display

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8
Q

List 5 mandatory ECDIS alarms

A
  • Crossing safety contour
  • Deviation from route
  • Mandatory sensor failure
  • Approach to critical point
  • Different geodetic datum
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9
Q

List 5 mandatory warning on ECDIS

A
  • Default safety contour
  • Information overscale
  • Larger scale ENC available
  • No ENC available
  • System test failure
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9
Q

List three factors to consider when setting a safety contour

A
  • Draught of vessel
  • Under Keel Clearance
  • Height of tide
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9
Q

Explain why each of the below should be considered when considering safety contour

  • Draught of vessel
  • Under Keel Clearance
  • Height of tide
A
  • This affects how far below the water line the seabed must be
  • This gives an additional margin of safety, squat should be considered
  • This gives additional water above Chart Datum that can be used
9
Q

How can the radar overlay confirm correct input information to the ECDIS?

A

When switched on the overlay should match the charted features underneath, such as coastline and buoyage. An offset would indicate error in GPS position, a rotation would indicate error in heading input.

9
Q

How can the radar overlay assist with pilotage navigation?

A

This helps with easy identification of navigation marks for position fixing and for vessels in the area. It also makes it easy to see where radar targets are in relation to a channel and where they are heading for.

9
Q

List two methods of correcting electronic charts up to date

A
  • Downloading and transfer to ECDIS by USB
  • Receiving update CD by mail and putting into computer
9
Q

Are Ts & Ps applied to electronic charts? Give reasons for your answer

A

Some are, it depends on the country of origin. UKHO apply Ts & Ps as corrections. Other hydrographic offices apply them, some only apply a selection and some do not apply them at all. Details can be found online.

9
Q

State how you can show Maritime Safety Information (MSI) on an ENC

A

Enter the information on the chart in the appropriate place using a

Mariner’s Note

10
Q

Dangers/ limits of ECDIS

A
  • Position information provided by GNSS – possible lack of accuracy.
  • Information Overload (tendency to obscure the view)
  • Over reliance on data on the screen and not looking out the window.
  • Potentially ‘old’ survey information.
    *Human error. Proper training is needed to mitigate risks.
    *Electronic equipment reliability.
11
Q

Define this symbol

A

Generic isolation danger symbol with less depth than user-selected contour or where depth is unknown.

12
Q

Define this symbol

A
  • Sounding information
  • 6 star
  • A1
  • All significant seafloor features detected. Very high accuracy of survey
13
Q

Define this symbol

A
  • Sounding quality
  • 5 Star
  • A2
  • All significant seafloor features detected. High accuracy of survey.
14
Q

Define this symbol

A
  • Sounding quality
  • 4 Stars
  • B
  • Uncharted features dangerous to navigation are not expected but may exist. Medium accuracy of survey.
15
Q

Define this symbol

A
  • Sounding quality
  • 3 stars
  • C
  • Depth anomalies may be expected. Low accuracy survey or passage soundings.
16
Q

Define this symbol

A
  • Sounding symbol
  • 2 star
  • D
  • Large depth anomalies may be expected.
  • Poor quality data
17
Q

Define this symbol

A

Survey quality symbol
U
Quality of bathymetry yet to be assessed.

18
Q

Define this symbol

A

Caution area with a specific caution note attached.

19
Q

Define this symbol

A

Dredged area deeper then safety contour. Dark blue indicates water shallower than safety contour.

20
Q

Define this symbol

A

Indicates boundary between IALA
A and B buoyage systems

21
Q

Define this symbol

A

Sounding of low accuracy

22
Q

Define this symbol

A

Indicates that additional information is available for interigation

23
Q

Define this symbol

A

Limit between area of unoffical vector data and official ENC data.

24
Q

ECDIS integrity monitoring

A

Electronic Chart Display and Information Systems (ECDIS) integrity monitoring refers to the process of ensuring the accuracy, reliability, and consistency of electronic navigational charts (ENCs) and related navigational information displayed on ECDIS systems. Integrity monitoring involves several key aspects:

Data Quality
Chart Updates:
Sensor Integration:
Alarm Monitoring:
User Training:

Overall, ECDIS integrity monitoring is essential for ensuring the reliability and accuracy of electronic navigation systems, thereby enhancing navigational safety and reducing the risk of accidents at sea.

25
Q

Under which conditions is a mariner likely to use display base

A
  1. Routine Navigation
  2. General situation awareness
  3. Back up Navigation
  4. Initial Route Planning

OOW Course Study Notes (9 decks)

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