Some info for all. I picked up some Panel Markers at Princess Auto for just a couple of bucks. These are military issue and grade. For use in emergencies, might not be a bad idea to have with you whether sledding of quadding. A website I found is below for a better explanation. I am going back to pick up a couple more too. Cheers.
www.bestglide.com/VS17_Signal_Panel_Marker.htmlCached - Similar
www.bestglide.com/VS17_Signal_Panel_Marker.htmlCached - Similar