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20-1
20. ALERTS
20.1 What is an Alert?
“Alert" is a generic name for a notice to any unusual or potentially dangerous situation
generated within the system.
Alerts are classified according to priority and category.
Alert priority
There are three alert priorities: alarm, warning and caution.
Alarm: Situations or conditions which require immediate attention, decision and (if
necessary) action by the bridge team to avoid any kind of hazardous situation and to
maintain the safe navigation of the ship.
Warning: Situations or conditions which require immediate attention for precautionary
reasons, to make the bridge team aware of conditions which are not immediately haz-
ardous, but may become so.
Caution: Awareness of a condition which continues to require attention out of the or-
dinary consideration of the situation or of given information.
Alert category
An alert is further classified by category, A, B or C, according to its degree of severity
or source.
Category Description
A Category A alerts include alerts indicating
• Danger of collision
• Danger of grounding
B Category B alerts are alerts where no additional information for decision
support is necessary. Category B alerts are all alerts not falling under
category A.
C IAS (Integrated Automation System) generated engine alert