8 Grouping of alarms and indicators
Clasification Society 2023 - Version 9.38
Statutory Documents - IMO Publications and Documents - International Codes - Alarms and Indicators - Code on Alarms and Indicators, 1995 Resolution A.830(19) - 8 Grouping of alarms and indicators

8 Grouping of alarms and indicators

  8.1 Where audible and visual alarms and indicators are required at central positions, e.g. on the navigating bridge, in the machinery space, or engine control room, the alarms and indicators should be arranged in groups, as far as practicable, except emergency alarms.

  8.2 The scope of alarms and indicators will vary with the type of ship and machinery. The basic recommendations given in tables 8.1 through 8.3 should be adhered to.

  8.3 When visual alarms are grouped in accordance with 2.10.2, individual alarms should be provided at the appropriate position to identify the specific alarm condition.

  8.4 The purpose of grouping is to achieve the following:

  • .1 In general: to reduce the variety in type and number of audible and visual alarms and indicators so as to provide quick and unambiguous information to the personnel responsible for the safe operation of the ship.

  • .2 On the navigating bridge:

    • .2.1 to enable the officer on watch to devote full attention to the safe navigation of the ship;

    • .2.2 to readily identify any abnormal situation requiring action to maintain the safe navigation of the ship; and

    • .2.3 to avoid distraction by alarms which require attention but have no direct influence on the safe navigation of the ship and which do not require immediate action to restore or maintain the safe navigation of the ship.

  • .3 In the machinery space/engine control room, to readily identify and locate any area of abnormal conditions (e.g. main propulsion machinery, steering gear, bilge level) and to enable the degree of urgency for remedial action to be assessed.

  • .4 In the engineers' public rooms and to each of the engineers' cabins on ships where the machinery space/engine control room is periodically unattended, to inform the engineer officer on watch of any alarm situation which requires immediate presence in the machinery space/engine control room.

Table 8.1 Grouping of alarms and indicators: machinery space attended, remote control of the main propulsion machinery from the navigating bridge not provided

Navigating bridge Machinery space
One common audible device, except emergency alarms
(e.g. buzzer, continuous)
Audible alarm devices in accordance with sections 4, 6 and 8.
1 2 3
Main steering position Other locations on navigating bridge Machinery space or control room
Individual visual alarms and indicators for:
Each required steering gear:
  • Power unit power failure
  • Control system power failure
  • Hydraulic fluid level alarm
  • Running indication
  • Alarm system failure alarm

Engine-room telegraph
Rudder angle indicator
Propeller speed/direction/pitch
Telephone call
Visual alarms and indicators at any position on the navigating bridge other than the main steering position for:
Required alarms and indicators, as indicated under "Notes" in table 9.1.1
Any non-required alarm or indicator which the Administration considers necessary for the officer on watch
Fire detection alarm
Visual alarms and indicators grouped at a position in the machinery space or, in the case of ships, provided with a control room, in that control room. In complex machinery alarm arrangements, due account should be taken of 8.4.3.
Alarms and indicators as indicated under "Notes" in table 9.1.2
Engine-room telegraph

Table 8.2 Grouping of alarms and indicators: machinery space attended, remote control of the main propulsion machinery from the navigating bridge provided

Navigating bridge Machinery space
One common audible alarm device, except emergency alarms
(e.g. buzzer, continuous)
Audible alarm devices in accordance with sections 4, 6 and 8.
1 2 3
Main steering position Other locations on navigating bridge Machinery space or control room
Individual visual alarms and indicators as in column 1 of table 8.1, plus:
Failure of remote control for main propulsion machinery
Starting air low pressure, when the engine can be started from the navigating bridge
Propulsion control station in control
Visual alarms and indicators at any position on the navigating bridge other than the main steering position as in column 2 of table 8.1, plus:
Machinery alarm, if provided
Alarms and indicators as in column 3 of table 8.1, plus:
Failure of remote control for main propulsion machinery
Starting air low pressure
Propulsion control station in control
Indication of propulsion machinery orders from navigating bridge
Alarms and indicators as indicated under "Notes" in table 9.1.2

Table 8.3 Grouping of alarms and indicators: machinery space unattended, remote control of the main propulsion machinery from the navigating bridge provided

Navigating bridge Machinery space
One common audible alarm device, except emergency alarms
(e.g. buzzer, continuous)
Audible alarm devices in accordance with sections 4, 6 and 8
1 2 3 4
Main steering position Other locations on navigating bridge Machinery space or control room Engineers' public spaces and accommodations
Individual visual alarms and indicators as in column 1 of tables 8.1 and 8.2, plus:
Override of automatic propulsion shutdown, if provided
Visual alarms and indicators at any position on the navigating bridge other than the main steering position as in column 2 of tables 8.1 and 8.2, plus:
Machinery space fire detection alarm
Alarm conditions requiring action by or the attention of the officer on watch on the navigating bridge
Alarms and indicators as indicated under "Notes" in table 9.1.1
As in column 3 of tables 8.1 and 8.2, plus:
Alarms as indicated under "Notes" in table 9.1.2
Alarm system power failure alarm
Engineers' alarm
Machinery space fire detection alarm
Machinery alarmfootnote
Steering gear alarm (common)footnote
Machinery space bilge alarmfootnote
Alarm system power failure alarm
Alarms and indicators under "Notes" in table 9.1.5

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