I received a battery operated chem light (not a Krill light-this was a gimmick thingy) that I have used on my S&R team several times. I usually turn it on, and hang it off my pack, so others can see me. Alternately, when I am racked out, I usually hang it above me so people know where I am. This actually serves two purposes; one, they an find me quickly if needed, two, vehicles will (hopefully) not run me over. Although, we dont normally nap in parking lots. But, hey, jst in case....