What is the purpose of a sounding device in a watertight compartment?

The purpose of a sounding device in a watertight compartment is primarily to measure the water level and detect flooding. This tool is crucial for assessing the stability and safety of compartments that may become compromised. By providing an accurate indication of water accumulation, crew members can make informed decisions regarding damage control measures, such as the need to initiate dewatering procedures or seal off affected areas to prevent further flooding. This proactive monitoring is essential for maintaining the integrity of the vessel and ensuring the safety of those on board.

Other options may relate to ship operations or safety but do not align with the specific function of a sounding device in the context of watertight compartments. For instance, detecting unauthorized access or providing communication does not pertain to water level measurement, and signaling for help relies on different equipment or protocols on the vessel.