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Linglis OOW Oral prep study, HIGH RISK questions > ECDIS > Flashcards

ECDIS Flashcards

1
Q

Purpose / advantages of ECDIS

A

Reduced workload for OOW

Improved SA

Real time position information

Overylaying, Admiralty info and Input

Safety Alarming

Automatic log book recording

Quick and easy corrections (done by professionals)

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2
Q

Disadvantages of ECDIS

A

Over reliance

Relies on integrity of feed inputs

Information overload

Alarm apathy

Potential ‘old’ survey information

High potential for user error

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3
Q

What makes an ENC

A

It meets the IMO performance standards under MSC 232 and therefore meets the carriage requirements of SOLAS

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4
Q

What Inputs must an ECDIS have?

A

GPS x 2
Speed (water log)
Gyro
UPS

Additional:
AIS/RADAR overlay

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5
Q

S52

A

Specifications for chart content and Display aspects of ECDIS
Current Version is S52 4.0

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6
Q

S57

A

Transfer standards for Digital Hydrographic Data

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7
Q

S61

A

Product specification for Rastar Navigational Charts

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8
Q

S63

A

Digital Data Incription

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9
Q

When can we run in RCDS

A

Rastar Chart Display System

No ENC available

Risk assessment has been carried out on the use of RCDS

An appropriate back up portfolio of Paper Charts is present

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10
Q

SENC

A

System Electronic Navigational Chart

A ENC is considered a SENC, when it is APPROVED, and has undergone lossless transformation of the database

Only an SENC is allowed for a paperless Bridge

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11
Q

What vessels are required to carry ECDIS?

A

Passenger ships ≥500gt
Cargo Ships ≥3000gt

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12
Q

Safety Contour

A

User set contour line depicting possible unsafe water on the other side. The system will highlight in bold the next deep contour line from the users chosen depth.
ESSENTIAL for safe navigation and monitoring

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13
Q

Safety Contour calculating

A

Draught + UKC allowance , swell, list etc + allowance for squat + Potentially HOT as well.

Colour between Safety and Shallow contour will be light blue

If it doesn’t match the set depth, it will automatically choose the next available depth contour

I.e. safety contour set to 7m. the ECDIS will choose a 10m contour

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14
Q

Safety Depth

A

User Chosen depth, beneath which isolated sountings will be in bold. Usually set to match the safety contour

ESSENTIAL for safety of navigation and monitoring

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15
Q

Safety frame

A

‘Guard zone’ similar to on a radar.
User set, commonly set to 1 NM either side in normal navigation, and 15 minutes ‘look ahead’ time

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16
Q

When an ECDIS is being used to satisfy the carriage requirements of SOLAS, what must be present?

What makes ECDIS ‘Approved’

A

Copy of type approval certificate, and standards applied

Connection to emergency source of electrical power, gyro compass, speed log and GPS receiver

Be maintained and up to date with the latest IHO standards (International Hydrographic Organisation)

A back up arrangement

When paper charts are the backup, these must also be up to date

17
Q

What is the AVCS?
What basis do we purchase charts

A

Admiralty Vector Chart Sevices
Single ENC units or Folios can be licensed for limited periods, 3,6,9,12 months,

Or by PAYS, Pay as you Sail
Where you get full coverage for passage planning, but only pay for the ENCs your vessel crosses

18
Q

Where can we get more guidance on ECDIS in RCDS mode?

A

MGN 285 - Electronic Charts - Use of risk assessment methodology when operating ECDIS in RCDS Mode

19
Q

Pros of Rastar Charts

A

User friendly as they are scans of original paper charts (familair)

Are approved as they are admiralty charts

Cheap to produce

Global coverage

20
Q

Negatives of Rastar Charts

A

Large file size

Not seamless, has boundaries

Not inherently intelligent (no alarms, layers, indications)

21
Q

Pros of Vector Charts

A

Can be interrogated

Alarms and Indications

Scalable with no distortion

Admiralty Information over layering

Own ship route monitoring

Apparently seamless joint between charts

22
Q

Negatives of Vector charts

A

Same Survey data as paper charts

Not all approved data

Unfamiliar Symbols to new users (specialist training required)

High chance of a false sense of security

Clutter in the wrong compilation scale

Expensive and timely to produce

23
Q

What is CATZOC

A

Category Zone of Confidence

Reliability indication of:
Position and depth

24
Q

Isolated danger symbol ECDIS

A

Will display isolated dangers less than the user set safety contour with this symbol

25
Q

List of MANDATORY ECDIS alarms

A

Crossing safety contour

Deviate from route

Position system failure

Approaching a critical point

Rastar Chart Navigational Mode (NON ENC area)

Different Geodetic Datum

26
Q

List of ECDIS Indications

A

Information overscale

Information underscale

Larger ENC available

Route plan over a safety contour

Route plan over a specified area

Position system failure (planning mode)

System test failure

27
Q

Ensuring Charts are up to date on ECDIS

A

ECDIS should display this data prominently on the screen

Or in the chart properties section, to the right side of the screen

We can also check our chart catalogue, and the charts not up to date will appear in orange

This interrogation of the properties can be type specific

28
Q

What methods can we use to update ECDIS charts?

A

Download file
USB
CD/DVD
Manually

Open file, only use the most recent update as they are cumulative
Read the ‘read me’ file
Perform update
Log

29
Q

UKHO is set to stop producing Paper Charts in what year?

A

2026

30
Q

Chart carriage requirements for yachts, as seen in LY3?

A

<3000gt:
Paper charts
1xECDIS + APC
2x ECDIS

> 3000gt
1x ECDIS + APC
2x ECDIS

31
Q

How do we check an ECDIS is up to date?

A

Open the IHO performance standards

Open Chart 1 on the ECDIS

Find the appropriate Lat and Long

Compare the symbols match between the performance standards and the Chart 1

32
Q

What Items are included in an ECDIS chart update?

A

Permits for charts
Vector Chart Display 1
Vector Chart Display 2
Admiralty Overlay (T’s & P’s)

Linglis OOW Oral prep study, HIGH RISK questions (39 decks)

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