What is the primary purpose of boat sheets?

The primary purpose of boat sheets is to control the orientation of the sails. Sheets are lines or ropes that adjust the angle of the sails relative to the wind, helping to maximize the boat's speed and maneuverability. By pulling in or letting out the sheets, a sailor can trim the sails to catch the wind effectively, allowing for better navigation and sailing efficiency. This is essential for sailing in various wind conditions and for optimizing the vessel's performance on the water.

While other options mention important aspects of boat operation, they do not pertain directly to the role of sheets in sailing. For instance, anchoring involves different equipment, and although steering is crucial, it is accomplished through the rudder, not sheets. Similarly, holding cargo in place is not related to the function of sheets but rather involves other securing mechanisms on a boat.