Which of the following parameters is required to be shown by a Stability Instrument?

The requirement to show the draft at draft marks on a Stability Instrument is crucial for determining the vessel's stability characteristics. The draft at draft marks provides vital information about how deep the ship is sitting in the water and is essential for calculating stability parameters such as the center of gravity and metacentric height. Accurate knowledge of the draft allows for proper assessment of the ship’s loading conditions and overall stability, which is fundamental to ensuring safety at sea.

The other parameters, while potentially useful in broader maritime contexts, do not specifically relate to the calculations for stability that a Stability Instrument is focused on. Type of cargo, weather conditions, and historical data can inform operational decisions and risk assessments but are not part of the core stability calculations that depend on the physical measurements directly tied to the ship's draft.