What must you have on a boat less than 12 meters in length?

On a boat less than 12 meters in length, you must have safety equipment such as life jackets for all passengers, a fire extinguisher, a sound signaling device (like a whistle or horn), and a first aid kit. Additionally, it's important to have navigation lights if you're operating at night or in low visibility. Depending on the region, you may also need to carry flares or other emergency signaling devices. Always check local regulations for specific requirements.