What is the significance of the number '123' in the compartment label?

The number '123' in the compartment label primarily indicates the starting frame of the compartment. In naval architecture, a ship's internal structure is divided into frames, which are vertical components running from the keel to the upper structure to provide support and shape to the hull. The starting frame number identifies the specific frame where the compartment begins, assisting crew members in quickly locating spaces within the vessel’s interior.

Understanding the compartment labeling system is crucial for navigation and operational efficiency on a ship. Each component of the label delivers essential information used for planning maintenance, conducting inspections, or managing logistics. This practice ensures that personnel can effectively communicate about spaces and their locations, which is pivotal during emergency situations or routine operational tasks.