Lalizas EMERGENCY Navigation Lights, SetLalizas EMERGENCY Navigation Lights, Set Emergency waterproof navigation lights are ideal for use on small crafts and inflatable boats etc. or as emergency lighting in larger vessels. They can be used when conventional lights are not suitable for the vessel or when they are not operating. Emergency navigation lights are available with external light reflectors and use standard alkaline batteries (D cell ), giving approx. 9 hours of continuous use.