ECDIS and ENC Standards Overview
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Questions and Answers

What does the 3rd digit in an ENC Cell name such as FR402424 refer to?

  • The week of the last update of the chart.
  • The code representing the country that has conducted the survey. (correct)
  • A navigational purpose of 4 - Approach.
  • The 4th edition of the chart.
  • When using a VECTOR chart display, what option is available?

  • Unlimited alarm capability.
  • Guaranteed full world coverage of official data.
  • Only one scale available, so no zoom capability.
  • The option to interrogate the charted objects (pick report). (correct)
  • Which of the following options is possible when using a RASTER chart system?

  • Display a digital image of an Admiralty paper chart. (correct)
  • Interrogate all charted objects (pick report).à
  • Set a user-defined safety contour.
  • Zoom in or out to have precision on some charted features.
  • What is possible when using a VECTOR chart display?

    <p>All of the above. (D)</p> Signup and view all the answers

    When entering the last known position from a GPS as a secondary sensor, what can be observed?

    <p>Essential data can be gathered by this method. (A)</p> Signup and view all the answers

    On which horizontal datum are ENC charts and GPS coordinates based?

    <p>WGS-84 (C)</p> Signup and view all the answers

    Which of the following is not a requirement of the IMO performance standard for ECDIS?

    <p>Provide the presentation in the same colours as paper charts. (A)</p> Signup and view all the answers

    What is the primary function of ECDIS?

    <p>Contribute to safe navigation. (B)</p> Signup and view all the answers

    Which organization is responsible for setting the performance standards of ECDIS?

    <p>International Maritime Organization (A)</p> Signup and view all the answers

    Which organization is responsible for setting the standards of Electronic Navigational Charts?

    <p>International Hydrographic Organization (A)</p> Signup and view all the answers

    What information must be displayed on the base layer of an ENC chart?

    <p>Coastline, safety contour, floating navigation marks, scale, range and north arrow, units of depth and height, and display mode. (C)</p> Signup and view all the answers

    Which of the following IHO standards covers the displayed colors used on ENC charts?

    <p>S-52 (C)</p> Signup and view all the answers

    What will generate an indication but no alarm on ECDIS?

    <p>Route planning across a specified area (D)</p> Signup and view all the answers

    What is a potential risk associated with using ECDIS?

    <p>Users may become overly reliant on ECDIS. (C)</p> Signup and view all the answers

    Which organisation is responsible for setting standards for ECDIS hardware?

    <p>International Electro-technical Commission (A)</p> Signup and view all the answers

    Which statement is accurate regarding Raster Navigational Charts (RNCs) with ECDIS while sailing under the UK flag?

    <p>RNCs are allowed if issued by a governmental hydrographic office. (B)</p> Signup and view all the answers

    What does ECDIS stand for?

    <p>Electronic Chart Display and Information System (D)</p> Signup and view all the answers

    What type of chart should be used for ECDIS to be considered fully compliant?

    <p>Electronic Navigational Chart (ENC) (D)</p> Signup and view all the answers

    Which statement is true regarding the IMO performance standards for ECDIS?

    <p>ECDIS should not increase the performance of input sensors. (D)</p> Signup and view all the answers

    What is the main function of a vector chart?

    <p>To store data of captured geographical objects and attributes. (B)</p> Signup and view all the answers

    What does DOP (dilution of precision) depends on?

    <p>The accuracy of the satellite fix geometry. (B)</p> Signup and view all the answers

    What is the correct interpretation of a safety contour in ECDIS?

    <p>It indicates the maximum depth for safe navigation. (C)</p> Signup and view all the answers

    In which situation must ECDIS trigger an alarm?

    <p>All of the above. (D)</p> Signup and view all the answers

    What is a Regional ENC Coordination Centre (RENC) responsible for?

    <p>Ensuring uniformity in ENC format and updates. (B)</p> Signup and view all the answers

    Which of the following inputs is essential for ECDIS?

    <p>Position, Heading, and Speed. (B)</p> Signup and view all the answers

    How should ENC updates be performed?

    <p>By corrections supplied by RENC. (C)</p> Signup and view all the answers

    Which is not a function available for route planning using ECDIS?

    <p>Dynamic adjustment of routes in real time. (B)</p> Signup and view all the answers

    What is the purpose of a RENC?

    <p>RENC stands for Regional ENC Co-ordination Centre and is to ensure uniformity in both formal and informal distribution of ENCs and updates. (D)</p> Signup and view all the answers

    Which of the following is NOT a feature of ECDIS?

    <p>Automatic monitoring of distress messages (C)</p> Signup and view all the answers

    What is the minimum requirement for voyage recording with ECDIS? "

    <p>The last 12 hours with interval not more than 1 minute and the whole voyage with intervals no more than 4 hours (D)</p> Signup and view all the answers

    Which of the following best describes a vector chart?

    <p>A database of individually captured objects and their geographical positions and attributes. (A)</p> Signup and view all the answers

    The symbol "U" found on an ENC chart indicates:

    <p>Accuracy of data presented on charts not assessed. (B)</p> Signup and view all the answers

    What is the purpose of the PERMIT.TXT file in ECDIS?

    <p>Enables ECDIS to decrypt and access ENC cells, ensuring the integrity of the data has not been compromised. (C)</p> Signup and view all the answers

    What may affect the DOP (dilution of precision) figure?

    <p>Poor satellite fix geometry. (D)</p> Signup and view all the answers

    What is the function of the secondary sensor in an ECDIS?

    <p>Monitors the primary sensor, which is part of the integrity monitoring function. (A)</p> Signup and view all the answers

    In which situation(s) does ECDIS need to trigger an alarm?

    <p>All of the above. (D)</p> Signup and view all the answers

    What could affect the accuracy of data presented on an ENC chart?

    <p>Poor quality data, large depth inaccuracies expected. (A), Low accuracy survey, depth anomalies may be expected. (B)</p> Signup and view all the answers

    What is the primary purpose of a Raster Navigational Chart?

    <p>To conform to international hydrographic office specifications. (A)</p> Signup and view all the answers

    Which of the following data categories CAN be shown on an ENC?

    <p>Base Display, Standard Display, and Al Other Information. (A)</p> Signup and view all the answers

    In case of an EPFS malfunction during a passage in a busy narrow channel, the mariner should:

    <p>Select an alternative position source such as another EPFS, DR, or EP as primary or secondary sensor while investigating. (A)</p> Signup and view all the answers

    According to the ECDIS Performance Standard, how is an alarm announced?

    <p>Announces by audible means, or audible and visible means that a condition requires attention. (C)</p> Signup and view all the answers

    What is the nature of the alarm triggered when a ship deviates from the planned route?

    <p>A cross-track limit alarm. (A)</p> Signup and view all the answers

    Voyage recording files in ECDIS must be stored in a way that they:

    <p>Cannot be manipulated or changed. (B)</p> Signup and view all the answers

    Flashcards

    VECTOR chart customization

    A VECTOR chart display allows users to customize the layers of displayed data, providing a personalized view of the chart.

    VECTOR chart pick report

    On a VECTOR chart display, users can access detailed information about specific charted objects through a feature known as a 'pick report'.

    RASTER chart display

    A RASTER chart system displays a digital image of a paper chart, preserving the original layout and details.

    ENC Cell name - 3rd digit

    ENC Cell names, like 'FR402424', use the third digit to indicate the navigational purpose of the chart.

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    RASTER chart zoom feature

    When zooming in on a RASTER chart system, you can see more detail on specific features.

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    Which horizontal datum do ENCs and GPS coordinates use?

    The standard used for Electronic Navigational Charts (ENCs) and GPS coordinates, ensuring compatibility.

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    Define an Electronic Navigational Chart (ENC) System.

    A database of information, in the manufacturer's internal ECDIS format, containing the information from an ENC content and updates.

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    Who sets performance standards for ECDIS?

    The International Maritime Organization (IMO) is responsible for defining the performance standards for ECDIS, ensuring they meet international safety requirements.

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    What organization sets standards for Electronic Navigational Charts (ENCs)?

    The International Hydrographic Organization (IHO) is responsible for setting the standards for Electronic Navigational Charts (ENCs), ensuring consistency and accuracy in nautical charts.

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    What is the primary function of ECDIS?

    The primary function of ECDIS is to contribute to safe navigation by providing an electronic display of nautical charts and related information, enhancing situational awareness and decision-making.

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    Which IHO standard defines the structure and content of ENCs?

    The IHO standard S-57 defines the structure and content of Electronic Navigational Charts (ENCs), ensuring compatibility between different chart providers.

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    Which IHO standard covers the presentation of raster navigational charts (RNCs)?

    The IHO standard S-52 defines the presentation of raster navigational charts (RNCs), which can be used in ECDIS.

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    Which IMO standard covers the presentation of RNCs?

    The International Maritime Organization (IMO) performance standard 5-81 defines the requirements for the presentation of RNCs, ensuring consistency in their appearance and implementation.

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    What is a RENC?

    A Regional Electronic Chart Co-ordination Centre (RENC) is an organization responsible for ensuring uniformity and consistency in the distribution and updating of electronic navigational charts (ENCs) within a specific region.

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    What is a Raster Navigational Chart (RNC)?

    A Raster Navigational Chart (RNC) is a digital representation of a traditional paper chart, created by scanning the paper chart and converting it into a digital format.

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    What are Raster Navigational Charts based on?

    A digital representation of a paper chart which conforms to international hydrographic office specifications.

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    What triggers an alarm in ECDIS?

    An alarm should trigger when the ship deviates from the planned route by a specified amount (cross-track limit).

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    What is a Vector Chart?

    A vector chart represents nautical information as a database of individual objects (buoys, shoals, etc.) and their geographical positions. It allows for flexible and scalable display of chart information.

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    What can affect 'DOP' ?

    The DOP (Dilution of Precision) figure can be affected by poor geometry of satellite signals, resulting in less accurate positioning.

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    What does the symbol 'U' on an ENC chart represent?

    This symbol on an ENC chart indicates that the data presented has not been assessed for accuracy and may be unreliable. The user should be cautious about using the information.

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    How should voyage recording files in ECDIS be stored?

    Voyage recording files must be stored in a way that prevents manipulation or alteration. They should not be easily editable.

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    What is the minimum voyage recording requirement for ECDIS?

    Voyage recording in ECDIS must meet the minimum requirement of recording the entire voyage with intervals of no more than 1 minute. Also, at least the past 12 hours must be stored with intervals of no more than 1 minute.

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    What is an ENC best described as?

    An ENC is a digital representation of official hydrographic data.

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    What information can an ECDIS display?

    The ECDIS system should be able to display information from GPS, AIS, and ARPA.

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    How does an ECDIS alarm function?

    An alarm in ECDIS should notify the mariner by visible means and/or audible means.

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    What is the PERMIT.TXT file used for?

    The PERMIT.TXT file enables decryption and access to ENC cells, ensuring data integrity and preventing unauthorized access.

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    What is the backup requirement when using ECDIS as the primary means of navigation?

    When using ECDIS as the primary means of navigation, paper charts are required as back-up. This backup must include the complete voyage plotted on paper charts.

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    Safety Contour?

    A safety contour identifies areas where there are potential hazards such as shallow water, obstructions or other hazards to navigation.

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    Range on a chart

    A range is a line of bearing used to identify a position along a coastline, waterway, or other geographic feature.

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    North Arrow

    The North Arrow on a chart indicates true or magnetic north. It helps with navigation and determining bearing.

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    DOP (Dilution of Precision)

    The accuracy of a measurement is shown by the DOP (Dilution of Precision) value. A higher DOP means lower accuracy.

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    Who sets ECDIS standards?

    The International Hydrographic Organisation (IHO) sets the standards of hardware and tests related to ECDIS.

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    What is ECDIS?

    ECDIS (Electronic Chart Display and Information System) is a system used to represent and display nautical charts electronically.

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    Vector Chart

    A vector chart is a database containing individually captured objects, their geographical positions, and attributes.

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    How to update ENCs?

    ENCs (Electronic Navigational Charts) should be updated using official corrections supplied by the Regional ENC coordination center (RENC)

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    Raster Chart

    A raster chart is a digital representation of a paper chart. It works like a scanned image.

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    What are the minimum sensor inputs for ECDIS?

    The minimum sensor inputs required for ECDIS include a position system, heading, speed, and radar.

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    What is ECDIS and why is it important?

    ECDIS (Electronic Chart Display and Information System) is a system used to display nautical charts electronically. It makes navigation safer and more efficient.

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    Raster Navigational Chart specifications?

    A raster chart conforms to the specifications of the International Hydrographic Organisation (IHO) and the International Association of Lighthouse Authorities (IALA)

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    Potential Risks of using ECDIS

    The user may rely too heavily on ECDIS and not be aware of the conditions that can affect the accuracy of the displayed information. This potential over-reliance can lead to poor decision making and incorrect navigation.

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    What route planning features are NOT available in ECDIS?

    Auto-plotting waypoints, verifying a route upon completion, and sound input of waypoint positions are not available in standard ECDIS routing planning features. The most commonly found features are route planning, route verification, and route editing.

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    Study Notes

    Horizontal Datums for ENCs and GPS

    • ENC charts and GPS coordinates are based on WGS-84.

    IMO ECDIS Performance Standard Requirements

    • ECDIS must continuously plot the ship's position.
    • ECDIS must provide means to display alarms related to system and input device performance.
    • ECDIS must allow route planning and monitoring.
    • ECDIS should not degrade the performance of sensor inputs
    • An ECDIS should not provide any system related alarms

    Electronic Navigational Chart (ENC) Definitions

    • An ENC is a database of information in a manufacturer's internal format, containing ENC content and updates.

    Responsibilities for Chart Standards

    • International Maritime Organization (IMO) sets ECDIS performance standards.
    • International Hydrographic Organization (IHO) sets Electronic Navigational Chart (ENC) standards.

    ECDIS Primary Function

    • The primary function of ECDIS is to contribute to safe navigation.

    Chart Types and Standards

    • Vector charts are databases of individual objects and attributes, following IHO S-57 standards, and are digitised versions of corrected paper charts.

    ENC Chart Information Requirements

    • The base layer of an ENC chart must display coastline, safety contours, floating navigation marks, scale, range & north arrow, depth & height units, and display modes.

    Potential ECDIS Risks

    • Users may over-rely on ECDIS and not account for potential inaccuracies.

    ECDIS Route Planning

    • ECDIS includes automatic waypoint plotting to avoid dangers, manual waypoint input, but does not include adjustment of solely parameters.

    ECDIS Operational Modes

    • Chart information layers can be selected by the mariner in ECDIS mode.

    ECDIS Hardware and Testing Standards

    • The International Electrotechnical Commission (IEC) sets standards for ECDIS hardware testing.

    Chart Data Display

    • Vector charts show layers of data that can be hidden for reducing display clutter.

    Using Raster Charts with ECDIS (Under UK Flag)

    • Raster charts can be used if suitable vector data is unavailable, after a risk assessment.

    Vector Chart Structure

    • A compliant vector chart is a digitized, corrected paper chart, or a database of official data that conforms to IHO S-57 standard.

    IHO Standards for Vector Chart Data Transfer

    • IHO S-57 standard covers the data transfer and database format of vector charts.

    GPS Sensor Interface with ECDIS

    • The antenna position of a GPS sensor must be entered into the ECDIS system settings for accurate data.

    Chart Type for ECDIS Compliance

    • ENCs are the required type of chart for full ECDIS compliance.

    Minimum ECDIS Sensor Inputs

    • The minimum sensor inputs for ECDIS are a position system, heading, and speed.

    Non-Compliant ECDIS Systems

    • Systems that fail to meet IMO standards are not considered ECDIS.

    ENC Chart Update Sources

    • Encs should be updated using corrections supplied by RENC (Regional ENC Co-ordination Centre).

    ECDIS Acronym Definition

    • ECDIS stands for Electronic Chart Display and Information System.

    RENC (Regional ENC Co-ordination Centre) Role

    • RENC ensures uniformity in format and distribution of ENCs and updates.

    Raster Navigational Chart Standards

    • Raster charts conform to international hydrographic office specifications.

    ECDIS Alarm Triggers

    • ECDIS alarms are triggered when the vessel is predicted to cross a safety contour, cross the boundary of a prohibited area, or exceed a specified cross-track limit from a planned route.

    ECDIS Data Types

    • Vector charts are databases of individually captured chart objects (features) with geographical positions.

    DOP (Dilution of Precision) Factors

    • Factors affecting DOP include poor satellite geometry, out-of-date charts, and clocks using the wrong timezone.

    ENC Chart Accuracy Symbol Interpretation

    • This symbol on an ENC chart represents an accuracy assessment, which may indicate either low accuracy surveys, depth anomalies, or quality not assessed.

    ECDIS Voyage Recording Requirements

    • Voyage recording files must be stored, not manipulated, and readily accessed, without edits.

    ECDIS Features

    • ECDIS features do not include automatic monitoring of distress messages

    Voyage Recording Minimum Requirements

    • ECDIS voyage recording should record at intervals of no more than 4 hours, with interval not exceeding 1 minute.

    ENC Chart Symbol Accuracy Interpretation

    • This ENC chart symbol signifies quality assessment for uniform standards, with different levels of reliability.

    ENC Data Categories

    • ENC charts display data in base layers, custom displays, and other layers.

    ECDIS Alarm Categories

    • Alarms are set by the navigator for safety contour intersection, anti-grounding depths, and safety depth clearance.

    ENC Definition

    • ENCs are the official data representations from governmental survey operations and are published by flag state authorities.

    EPFS / ECDIS Malfunction Handling

    • In case of EPFS malfunction, select an alternate position source as primary or secondary to aid investigation.

    Secondary Sensors in ECDIS

    • Secondary sensors monitor the primary sensor for overall system integrity.

    ECDIS Information Sources

    • ECDIS collects information from GPS, AIS, and ARPA systems.

    ECDIS Alarm Characteristics

    • ECDIS alarms announce conditions requiring attention both visually and/or audibly.

    PERMIT.TXT File

    • PERMIT.TXT contains the user permit allocated to the ECDIS station to use ENC data.

    SOLAS Backup Requirements for ECDIS

    • When using ECDIS, paper charts should be used as backup, plotting the complete voyage if ECDIS malfunctions

    GPS Position Acquisition Methods

    • Ship position can be obtained via the GPS as a primary or secondary sensor, or by manually inputting a last known position.

    Vector Chart Display Capabilities

    • Vector charts offer multiple scales, interrogating capabilites, and customization.

    Raster Chart Display Capabilities

    • Raster charts display digital copies of Admiralty paper charts with zoom capabilities but lack data interrogation.

    ENC Cell Name Third Digit Meaning

    • The third digit in an ENC cell name (e.g., FR402424) represents the country responsible for surveying that area.

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    Description

    This quiz covers the essential aspects of ECDIS performance standards and Electronic Navigational Charts (ENC). You will learn about the responsibilities of the International Maritime Organization and the International Hydrographic Organization regarding navigation safety and chart standards. Test your knowledge on the significance of horizontal datums and chart types.

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