5.29 Operational Alarms
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Statutory Documents - IMO Publications and Documents - Resolutions - Maritime Safety Committee - Resolution MSC.192(79) - Adoption of the Revised Performance Standards for Radar Equipment - (Adopted on 6 December 2004) - Annex - Revised Recommendation on Performance Standards for Radar Equipment - 5 Operational Requirements for the Radar System - 5.29 Operational Alarms

5.29 Operational Alarms

 A clear indication of the cause for all alarm criteria should be given.

  • 5.29.1 If the calculated CPA and TCPA values of a tracked target or activated AIS target are less than the set limits:

    • A CPA/TCPA alarm should be given.
    • The target should be clearly indicated.

  • 5.29.2 The preset CPA/TCPA limits applied to targets from radar and AIS should be identical. As a default state, the CPA/TCPA alarm functionality should be applied to all activated AIS targets. On user request the CPA/TCPA alarm functionality may also be applied to sleeping targets.

  • 5.29.3 If a user defined acquisition/activation zone facility is provided, a target not previously acquired/activated entering the zone, or is detected within the zone, should be clearly identified with the relevant symbol and an alarm should be given. It should be possible for the user to set ranges and outlines for the zone.

  • 5.29.4 The system should alert the user if a tracked radar target is lost, rather than excluded by a pre-determined range or pre-set parameter. The target's last position should be clearly indicated on the display.

  • 5.29.5 It should be possible to enable or disable the lost target alarm function for AIS targets. A clear indication should be given if the lost target alarm is disabled.

    If the following conditions are met for a lost AIS target:

    • The AIS lost target alarm function is enabled.
    • The target is of interest, according to lost target filter criteria.
    • A message is not received for a set time, depending on the nominal reporting rate of the AIS target.

    Then:

    • The last known position should be clearly indicated as a lost target and an alarm be given.
    • The indication of the lost target should disappear if the signal is received again, or after the alarm has been acknowledged.
    • A means of recovering limited historical data from previous reports should be provided.
Parent topic: 5 Operational Requirements for the Radar System
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