5.1 Supplemental visual alarms and calls provided
in machinery spaces with high ambient noise levels and in accommodation
.1 be clearly visible and distinguishable either
directly or by reflection in all parts of the space in which they
.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.