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Nav & Radar > ECDIS > Flashcards

ECDIS Flashcards

1
Q

Purpose of ECDIS? (3 factors)

A
  1. Reduce OOW workload (passage planning, updates, route monitoring)
  2. Contribute to safe navigation
  3. Pre warn of something dangerous or something that might lead to something dangerous
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2
Q

Difference between ECDIS & ECS?

A

Electronic Chart Display Information System has high standards from IMO and IHO in terms of hardware, software, charts and back up power arrangements, can be used as paperless bridge under solas chapter 5 and Electronic Chart System is any system that doesn’t reach those requirements

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3
Q

What do you need to have an approved ECDIS system onboard?

A
  1. Two fully independent ECDIS systems with individual reserve back up power and connected to emergency power,
  2. Need to be able to display both raster and vector charts,
  3. They must have separate position input,
  4. Must have heading (gyro) & speed (log) inputs
  5. Need to display AIS, ARPA & radar information,
  6. Need to be corrected on a weekly basis or manually corrected,
  7. Operator must be able to overlay information,
  8. Hardware must be approved by IEC,
  9. ECDIS must display an SENC
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4
Q

S-52?
S-57?
S-63?
S-61?

A

S-52. Display standard for ENCs
S-57. Digital data transfer exchange
S-63. Digital data encryption
S-61. Raster chart standards

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5
Q

Raster chart definition?

A

High quality scan of an existing paper chart

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6
Q

Advantages Raster charts? (4 factors)

A
  1. Global coverage
  2. Familiar
  3. Fully approved
  4. Cheap
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7
Q

Disadvantages Raster charts?

A
  1. Large file sizes
  2. Cluttered when zoomed out
  3. Different scales
  4. Not scalable
  5. Not intelligent (grounding alarms)
  6. Not seamless (has boundaries)
  7. Cant be used as a primary mean of navigation (need to get paper charts for that part of the voyage)
  8. Navigational risk assessment of the part of the voyage where the raster chart is used
  9. Can only be used where SENCs aren’t available
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8
Q

Vector chart definition?

A

Multi layered database of information

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9
Q

Advantages vector charts?

A
  1. Intelligent (can be interrogated)
  2. Apparently seamless
  3. Scalable with no distortion when zooming
  4. Information layers may be added or removed
  5. Alarms & indications
  6. Ability to monitor own ship’s route
  7. Small file sizes when updating
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10
Q

Disadvantages vector charts?

A
  1. Expensive and timely to produce,
  2. Same survey data as paper,
  3. Not all approved/official data,
  4. Unfamiliar symbols,
  5. Operator error
  6. High chance of a false sense of security
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11
Q

Display options?

A

Display base, standard display, all display & custom display

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12
Q

Whats shown on Display base?

A
  1. Land,
  2. Own ships safety contour
  3. Scale
  4. Range,
  5. North arrow
  6. Drying heights
  7. Isolated dangers within the safety contour
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13
Q

Whats shown on Standard display?

A

Everything in Display base plus
1. Bouys
2. TSS
3. Special areas
4. Ferry routes

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14
Q

What is CATZOC?

A

A quality scale of position and depth (A1, A2, B, C, D, U)

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15
Q

Generic Isolated danger symbol?

A

Octagon with a cross

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16
Q

List 5 alarms that ECDIS will sound?

A

Audible & visible, which require immediate attention
1. Deviation from route
2. Crossing safety contour
3. Position system failure
4. Approaching critical point
5. Entering non ENC area (Raster chart area)
6.Different Geodetic datum

17
Q

List 5 indications ECDIS will show?

A

Visual or audible, can lead to dangerous situation in future
1. Over scaling
2. Under scaling
3. Route planning over safety contour
4. Route planning over special area
5. System test failure

18
Q

What is Integrity monitoring?

A
  1. Detecting chart errors
  2. Position accuracy monitoring
  3. Handling sensor failures
  4. Display integrity and reliability
  5. Safety parameter monitoring
  6. Alarm generation
19
Q

What is needed of the operator?

A
  1. Verify the data being fed into ECDIS (sensors, inputs)
  2. Verify overlays (AIS, ARPA, RADAR)
  3. Visually, manually go over route planning
  4. Acknowledge and act on alarms
20
Q

Advantages of ECDIS?

A
  1. Ships position continuously displayed
  2. Improved spatial awareness for the watch keeper
  3. Multiple displays at conning position/ nav station/ lookout
  4. Information overlays to increase situational awareness
  5. Quick and easy route planning
  6. Automatic log book recording
  7. Quick and easy chart corrections
  8. Professional chart correction
  9. Alarms
21
Q

Disadvantages of ECDIS?

A
  1. Over-reliance on ECDIS
  2. Information overload
  3. Big reliance of GPS - possible lack of accuracy
  4. False sense of security
  5. Specialist training
  6. Alarm apathy
  7. Expensive

Nav & Radar (21 decks)

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