What must you carry aboard a 25 foot powerboat when operating at night?

When operating a 25-foot powerboat at night, you must carry navigation lights, which include a stern light and side lights, to ensure visibility and compliance with maritime regulations. Additionally, you should have a sound-producing device, such as a whistle or horn, for signaling. It's also advisable to have a flashlight or other means of illumination for safety and navigation purposes. Lastly, proper safety equipment like life jackets should always be on board.