Anything reflective can come into play as a visual distress signal. Use CD’s, car mirrors, polished metal, and whatever else you can scrounge to reflect sunlight toward distant targets. Sweep the light up and down, and side to side to ensure that your target sees a flash of light. The further away they are, the harder they are to hit, so keep it up as long as you can. If you can still see the target, which could be a distant boat, plane, vehicle, or people walking, then keep on signaling.