I've been sailing cruising boats for over 50 yrs. The one thing I was taught at an early age was that a good sailor always carries a knife. I would add he should also carry a Photon X-Light Micro LED.In an emergency on a boat things usually go wrong in dark places, in engine rooms, bilges or cabinets . You will waste valuable time looking for a flashlight. I always have a Photon X-Light Micro LED in my pocket.