Types of alarms and warning indicators

 

 

The ECDIS will have a means of warning if something is wrong with either the ECDIS itself developing a fault, or if it has detected an approaching navigation problem.

 

 

There are three categories of problems which can trigger warnings:

 

 

1.  Navigational hazards, alerting the operator to a potential navigational hazard during route planning or monitoring, such as the ship crossing a safety contour.

2.  Information in-put malfunction, indicating the breakdown of a sensor, such as the failure of the

GPS or of the ECDIS itself.

3.  Information conflict, indicating a datum or chart mis-match, such as a changed horizontal geodetic datum or a wrong scale setting which could cause a miscalculation of distances.

 

 

An ECDIS uses two levels of warning signal to alert the operator that something needs his immediate attention - an indication and an alarm:

 

Indication: this is announced by visual means, and signals information about the condition of an external system or about the ECDIS itself.

 

Alarm: this is announced by either audible means only, or by both audible and visual means. An alarm requires an immediate response from the operator.

 

 

IMO Resolution A.830 (19) Code on Alarms and Indicators

 

 

A r eas which Special Conditions Exist - ECDIS should detect and provide an alarm or indication

 

 

• Traffic Separation zone

• Inshore Traffic zone

• Restricted area

• Caution area

• Offshore production area

• Areas to be avoided

• User defined areas to be avoided

• Military practice area

• Seaplane landing area

• Submarine transit lane

• Anchorage area

• Marine farm/aquaculture

• PSSA (Particularly Sensitive Sea Area)

 

 

ECDIS should give alarm and or indication as per following table; Crossing safety contour

Area with special conditions

Deviation from route Positioning system failure Approach to critical point Different geodetic datum Malfunction of ECDIS Default safety contour Information over scale Large scale ENC available Different reference system No ENC available Customised display

Route planning across safety contour Route planning across specified area Crossing a danger in route monitoring mode System

test failure

 

 

Alarm

Alarm or Indication

Alarm Alarm Alarm Alarm

Alarm or Indication Indication

Indication

Indication

Indication

Indication

 

1.4           Symbols & information display

 

Admiralty guide to symbols used on ENC’s

 

S t andard display means the SENC 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.

 

 

Display base means the level of SENC information which cannot be removed from the display, consisting of information which is required at all times in all geographical areas and all circumstances. It is not intended to be sufficient for safe navigation, thus must never be used for navigation.

 

 

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