46 CFR §119.530

1. (a)Each vessel must be provided with a visual and audible alarm at the operating station to indicate a high water level in each of the following normally unmanned spaces:
   1. (1)A space with a through-hull fitting below the deepest load waterline, such as a lazarette;
   2. (2)A machinery space bilge, bilge well, shaft alley bilge, or other spaces subject to flooding from sea water piping within the space; and
   3. (3)A space with a non-watertight closure , such as a space with a non-watertight hatch on the main deck.
2. (b)A visual indicator must be provided at the operating station to indicate when any automatic bilge pump is operating.