What is ground tackle used for on a ship?

Ground tackle refers to the equipment used on a ship to secure it to the seabed to prevent it from drifting due to wind or current. This includes anchors, chains, and cables. The primary purpose of ground tackle is to moor or anchor the vessel, ensuring it stays in a fixed position when at rest. When a ship is anchored, the ground tackle holds it in place safely, allowing for stability while in port or during operations at sea.

The other choices relate to different functions: propelling the ship forward pertains to engines or sails; navigating during storms involves navigation instruments and techniques; and repairing the ship's hull involves maintenance tools and procedures unrelated to anchoring or mooring. Thus, the correct answer clearly reflects the specific use of ground tackle in maritime operations.