Appendix - Definitions
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Resolutions - Maritime Safety Committee - Resolution MSC.191(79) - Performance Standards for the Presentation of Navigation-Related Information on Shipborne Navigational Displays - (Adopted on 6 December 2004) - Annex - Recommendation on Performance Standards for the Presentation of Navigation-Related Information on Shipborne Navigational Displays - Appendix - Definitions

Appendix - Definitions

Activated AIS target A target representing the automatic or manual activation of a sleeping target for the display of additional graphically presented information.
AIS target A target generated from an AIS message.
Associated target A target simultaneously representing a tracked radar target and AIS target having similar parameters (e.g. position, course, speed) and which comply with an association algorithm.
CCRP The Consistent Common Reference Point is a location on own ship, to which all horizontal measurements such as target range, bearing, relative course, relative speed, closest point of approach (CPA) or time to closest point of approach (TCPA) are referenced, typically the conning position of the bridge.
Dangerous target A target with a predicted CPA and TCPA that violates values preset by the operator. The respective target is marked by a "dangerous target" symbol.
Display base The level of information which cannot be removed from the ECDIS display, consisting of information which is required at all times in all geographic areas and all circumstances. It is not intended to be sufficient for safe navigation.
ENC Electronic Navigational Chart. The database standardized as to content, structure and format according to relevant IHO standards and issued by, or on the authority of, a Government.
Heading Direction in which the bow of a ship is pointing expressed as an angular displacement from north.
Important indication A marking of an operational status of displayed information which needs special attention, e.g. information with low integrity or invalid information.
Lost target A target representing the last valid position of a target before its data was lost. The target is displayed by a "lost target" symbol.
Operational display area Area of the display used to graphically present chart and radar information, excluding the user dialogue area. On the chart display this is the area of the chart presentation. On the radar display this is the area encompassing the radar image.
Past positions Equally time-spaced past position marks of a tracked or reported target and own ship. The co-ordinates used to display past positions may be either relative or true.
Sleeping AIS target A target indicating the presence and orientation of a vessel equipped with AIS in a certain location. The target is displayed by a sleeping target symbol. No additional information is presented until activated.
Selected target A target selected manually for the display of detailed alphanumeric information in a separate data display area. The target is displayed by a "selected target" symbol.
Standard display The level of information that should be shown when a chart is first displayed on ECDIS. The level of the information it provides for route planning or route monitoring may be modified by the mariner according to the mariner's needs.
Trial manoeuvre Facility used to assist the operator to perform a proposed manoeuvre for navigation and collision avoidance purposes, by displaying the predicted future status of all tracked and AIS targets as a result of own ship's simulated manoeuvres.
User dialogue area An area of the display consisting of data fields and/or menus that is allocated to the interactive presentation and entry or selection of operational parameters, data and commands mainly in alphanumeric form.
User selected presentation An auxiliary presentation configured by the user for a specific task at hand. The presentation may include radar and/or chart information, in combination with other navigation or ship related data.
Parent topic: Annex - Recommendation on Performance Standards for the Presentation of Navigation-Related Information on Shipborne Navigational Displays
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