Non-pyrotechnic devices include orange smoke, a distress flag, or a signal light. No single device is ideal under all circumstances. While pyrotechnics are excellent signals, there is a potential for injury, and they can ignite flammables such as fuel. Pistol-type launchers are considered firearms in some states and may be prohibited. Regardless of the type of device you choose, you must carry a minimum of three visible by day and three visible at night.
Most boaters carry one of the many different distress signal kits, which are widely available.
Fire Extinguishers You must carry fire extinguishers if you have an inboard engine, any closed compartment where fuel or flammable liquid is stored, permanent fuel tanks, or enclosed living space. Of course, extinguishers should be regularly inspected and topped off as required, and should be readily accessible. Before starting engine, operate blower for at least 4 minutes and check engine compartment bilge for gasoline vapors. Boat owners are responsible for keeping their ventilation systems in operating condition. So for all practical purposes, you must carry a power whistle, or a power horn and a bell.