18 A system is needed to indicate that an alert
officer of the navigational watch is present on the bridge.
19 Any system used for verification of the officer
of the navigational watch alertness should not cause undue interference
with the performance of bridge functions.
20 The system should comply with technical requirements
laid down by a competent national authority.
21 The system should be so designed and arranged
that it could not be operated in an unauthorized manner.
22 Any system used for periodic verification of
the officer of the navigational watch alertness should be adjustable
up to 12-minute intervals and constructed, fitted and arranged so
that only the ship's master has access to the component for setting
the appropriate intervals.
23 Any authorized system should provide for the
acknowledgement by the officer of the navigational watch at the workstation
and other appropriate locations in the bridge from where a proper
look-out may be kept.
24 Such a system should be connected to an alarm
transfer system described in paragraphs 28
to 31.