BS ISO 21195-2020 Ships and marine technology – Systems for the detection of persons while going overboard from ships (man overboard detection).
The periphery of the ship is defined as the widest part of the ship at any location and is extended to include lifeboats. Other enclosed objects that protrude over the edge of the ship (e.g. rides, slides, etc.) do not modify the ship periphery.
System coverage shall be determined by using a general arrangement drawing (e.g. blueprint, computer- aided design model, etc.) of the ship, sensor installation locations, and the detection envelope of the sensor units.
5.8 MOB Indication Initiators
The system shall be capable of initiating an MOB indication based on data captured from the sensor units.
The system shall not require human interaction to trigger an MOB indication.
The system shall allow users to manually initiate an MOB indication at the control station for the purposes of initiating a drill or if manual review of video imagery indicates an MOB event that did not cause an alarm. Manually initiated MOB indications shall occur immediately. MOB indications manually initiated for the purpose of a drill shall be designated as a drill within the system.
5.9 Visual indication
The system shall generate a visual indication in response to an MOB event. The visual indication shall remain active until the MOB event has been acknowledged at the control station. The visual presentation of the indication shall satisfy the requirements set forth in IMO Resolution A.1021(26). Visual indications displayed on the bridge shall comply with relevant clauses of IEC 62288.
5.10 Audible indication
Once an MOB event has been initiated, the system shall generate an audible indication. The audible indication shall remain active until acknowledged at the control station.
When active, audible indications located on the navigation bridge shall have an acoustic noise level between 75 dB(A) and 85 dB(A) at distance of 1 m from the system, as defined in IEC 60945:2002, 11.1.
Audible presentation of MOB events on the bridge shall comply with relevant clauses of IEC 62288.
Audible indications installed in locations other than the navigating bridge shall follow the guidance set
forth by IMO Resolution A.1021(26).
5.11 MOB verification data
The system shall make available MOB verification data, in the form of still or video images, to a human operator within 5 s of an MOB alert.
The system shall allow a human operator to control the playback of available MOB verification data. MOB verification data shall include:
a) data obtained from the sensor unit(s) that initiated the MOB indication; and
b) data obtained from 5 s before the MOB event until 5 s after.
The resolution of the MOB verification data shall be sufficient to allow for a human operator to distinguish between a human and other objects at the maximum range of the detection envelope of the sensor.
5.12 MOB Event actions
The system shall allow authorized system users to acknowledge, deny or confirm an MOB indication at the control station. Each action shall produce a different system response, the details of which can be found in Table 2.BS ISO 21195 pdf download.