What does the term "navigational draft" refer to on a ship?

Navigational draft refers specifically to the distance a ship is submerged in water, which is critical for ensuring that the vessel can safely navigate through various waterways without running aground. The draft of a ship, measured from the waterline to the lowest part of the hull, determines how deep a vessel is in the water and is influenced by factors such as cargo load, fuel, and ballast.

Understanding navigational draft is essential for the Deck Watch Officer as it directly relates to safe navigation and operational planning. Maintaining awareness of the draft allows for effective route planning in shallow waters and ensures compliance with port regulations while avoiding hazards.

In contrast, the other options do not relate to the definition of navigational draft. The total cargo weight is relevant for stability and loading calculations, maximum speed pertains to operational efficiency and engine performance, while the safety margin determined by the commanding officer is more about overall safety management rather than a specific technical measurement like draft.