• This regulation applies to all bulk carriers, regardless of their date of construction.
• All such vessels must be fitted with a water level detection and alarm system in specific spaces.

The detectors are designed to provide audible and visual alarms. These detectors are to be fitted in the cargo holds, ballast spaces, and dry spaces of bulk carriers. Specifically, the water level detector in cargo holds shall be fitted in the aft end. For cargo holds that are used for water ballast, an alarm overriding device may be installed. The visual alarm on the navigating bridge shall clearly differentiate between the two distinct water levels detected in each cargo hold.

Each cargo hold shall be provided with audible and visual alarms as follows:

• One alarm when water reaches 0.5 m above the inner bottom.
• Another alarm when water reaches a height of not less than 15% of the cargo hold depth, but not more than 2 m.

In any ballast tank forward of the collision bulkhead, an audible and visual alarm must be activated when the liquid reaches no more than 10% of the tank capacity.

• In any dry or void space (excluding chain cable lockers), located forward of the foremost cargo hold, an audible and visual alarm must be activated when water reaches 0.1 m above the deck.

• For cargo holds used for water ballast, an alarm overriding device may be installed to be activated when the tank is in use.
• The visual alarm shall clearly discriminate between the two different water levels detected in the cargo hold.
• An alarm need not be provided in enclosed spaces where the volume does not exceed 0.1% of the ship's maximum displacement volume.
• All specified audible and visual alarms shall be located on the navigating bridge.