Steer vessels and operate navigational instruments. Put fishing equipment into the water and anchor or tow equipment, according to the fishing method used. Maintain engines, fishing gear, and other on-board equipment; and perform minor repairs. Sort, pack, and store catch in holds with salt and ice. Remove catches from fishing equipment and measure them to ensure compliance with legal size. Locate fish, using fish-finding equipment. Return undesirable or illegal catches to the water. Pull and guide nets, traps, and lines onto vessels, by hand or using hoisting equipment. Direct fishing operations, and supervise fishing crew members. Signal other workers to move, hoist, and position loads. Compute positions and plot courses on charts to navigate vessels, using instruments such as compasses, sextants, and charts. Oversee the purchase of supplies, gear, and equipment such as fuel, netting, and cables. Attach nets, slings, hooks, blades, and/or lifting devices to cables, booms, hoists, and/or dredges. Transport fish to processing plants or to buyers. Interpret weather and vessel conditions to determine appropriate responses. Wash decks, conveyors, knives, and other equipment, using brushes, detergents, and water. Connect accessories such as floats, weights, flags, lights, or markers to nets, lines, or traps. Load and unload vessel equipment and supplies, by hand or using hoisting equipment.