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IMO Performance Standards for ECDIS

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As per IMO Resolution A.817(19) Recommendations for IMO Performance Standards for ECDIS, adopted on 23 November 1995

A. ECDIS should be capable of displaying all SENC information. 

“The System Electronic Navigational Chart (SENC) means a database resulting from the transformation of the ENC by ECDIS for appropriate use, updates to the ENC by appropriate means and other data added by the mariner. It is this database that is actually accessed by ECDIS for the display generation and other navigational functions and is the equivalent to an up-to-date paper chart.”

B. SENC information available for display during route planning and route monitoring should be subdivided into three categories, display base, standard display, and all other information.

C. ECDIS should present the standard display at any time by single operator action.

D. When a chart is first displayed on ECDIS, it should provide the standard display at the largest scale available in the SENC for the displayed area.

E. It should be easy to add or remove information from the ECDIS display. It should not be possible to remove information contained in the display base.

F. The ENC and all updates to it should be displayed without any degradation of their information content.

G. It should be possible for the mariner to select a safety contour from the depth contours provided by the SENC. ECDIS should give the safety contour more emphasis than other contours on the display.

H. It should be possible for the mariner to select a safety depth. ECDIS should emphasize soundings equal to or less than the safety depth whenever spot soundings are selected for display.

I. ECDIS should provide a means of ensuring that the ENC and all updates to it have been correctly loaded into the SENC.

J. ECDIS should provide a method to ensure that the ENC and all updates to it have been correctly loaded into the SENC.

K. The ENC data and updates to it should be clearly distinguishable from other displayed information.

L. ECDIS should be interfaced with:

  • A ship’s Position-fixing system,
  • To gyro compass and
  • To speed and distance measuring device.

For any ships without a gyrocompass, ECDIS should be connected to a marine transmitting heading device.
Additional navigation systems incorporated into ECDIS can include but are not limited to:

  • AIS
  • RADAR
  • VDR
  • Echosounder
  • NAVTEX

M. ECDIS should be possible for the mariner to select a safety contour from the depth contours provided by the SENC. ECDIS should emphasize the safety contour over other contours on the display.

N. ECDIS should be possible for the mariner to select a safety depth. ECDIS should emphasize soundings equal to or less than the safety depth whenever spot soundings are selected for display.

O. Display Mode and Generation of Neighbouring Area:

  • It should always be possible to display the SENC in a “North Up” orientation. other orientations are permitted.
  • ECDIS should provide for true motion mode. Other modes are permitted.
  • When true motion mode is in use, reset and generation of the neighbouring area should take place automatically at a distance from the border of the display determined by the mariner

P. Colours and Symbols

  • IHO recommend colours and symbols should be used to represent SENC information
  • The colours and symbols other than those mentioned above should be those used to describe the navigational elements
  • SENC information when displayed at the scale specified in the ENC should use the specified size of symbols, figures and letters
  • ECDIS should allow the mariner to select whether own ship is displayed in true scale or as a symbol

Q. Display Requirements & Symbols: ECDIS must be capable of showing

  • Route planning and supplementary navigation tasks;
  • Route Monitoring
  • The effective size of the chart presentation for route monitoring should be at least 270 mm by 270 mm.

R. Provision and Updating Chart Information:

  • The chart information to be used in ECDIS should be the latest edition of that originated by a government-authorized hydrographic office and conform to IHO standards.
  • The contents of the SENC should be adequate and up-to-date for the intended voyage to comply with Regulation V/20 of the SOLAS 1974.
  • It should not be possible to alter the contents of the ENC. Updates should be stored separately from the ENC.

S. Display for other navigational information:

  • Radar information or other navigational information may be added to the ECDIS display. However, it should not degrade the SENC information and it should be clearly distinguishable from the SENC information.
  • ECDIS and added navigational information should use a common reference system. If this is not the case, an indication should be provided.

T. Route Planning, Monitoring and Voyage Recording:

  • It should be possible to carry out route planning and route monitoring in a simple and reliable manner including both straight and curved segments
  • It should be possible to adjust a planned route by, for example: Adding waypoints to a route, Deleting waypoints from a route, Changing the position of a waypoint, Changing the order of the waypoints in the route.
  • It should be possible to plan an alternate route in addition to the selected route. The selected route should be clearly distinguishable from the other.

U. Connections with other equipment:

  • ECDIS should not degrade the performance of any equipment providing sensor inputs. Nor should the connection of optional equipment degrade the performance of ECDIS below this standard.
  • ECDIS should be connected to systems providing continuous position fixing, heading and speed information.

V. Performance Tests, Malfunction Alarms and Indications:
– ECDIS should be provided with means for either automatically or manually carrying out on-board tests of major functions. In case of a failure, the test should display information to indicate which module is at fault.

W. Power Supply:
– It should be possible to operate ECDIS and all equipment necessary for its normal functioning when supplied by an emergency source of electrical power in accordance with the appropriate requirements of SOLAS Chp. II-1
– Changing from one source of power supply to another or any interruption of the supply for a period of up to 45 seconds should not require the equipment to be manually re-initialized.

Do you know the definition of ECDIS? What is ECDIS?

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