5 Visual alarms, calls 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) - 5 Visual alarms, calls and indicators

5 Visual alarms, calls and indicators

  5.1 Supplemental visual alarms and calls provided in machinery spaces with high ambient noise levels and in accommodation spaces should:

  • .1 be clearly visible and distinguishable either directly or by reflection in all parts of the space in which they are required;

  • .2 be of a colour and symbol in accordance with tables 6.1.1 to 6.1.3;

  • .3 flash in accordance with 5.2;

  • .4 be of high luminous intensity; and

  • .5 be provided in multiple in large spaces.

  5.2 Flashing alarms and calls should be illuminated for at least 50% of the cycle and have a pulse frequency in the range of 0.5 Hz to 1.5 Hz.

  5.3 Visual alarms and indicators on the navigating bridge should not interfere with night vision.

  5.4 Alarms and indicators should be clearly labelled unless standard visual indicator symbols, such as those in tables 6.1.1 to 6.1.3, are used. These standard visual indicator symbols should be arranged in columns for ready identification from all directions. This applies in particular to the emergency alarms in table 6.1.1. Standard visual indicator symbols may also be used on consoles, indicator panels, or as labels for indicator lights.

  5.5 Alarm and indicator colours should be in accordance with ISO Standard 2412 as deemed appropriate by the Administration.

  5.6 On MODUs, where supplemental visual alarms are installed for general emergency alarms, the colour of these supplemental alarms may be amber, provided they flash with a pulse frequency of at least 4 Hz.


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