better idea
most flares are pretty useless unless you are on the water. Shotgun flares, pencil flares and the like can barely clear the treetops in winter, or 50m in summer. Virtually impossible for ground searchers to see, and difficult from the air, as well. I am a Civil Air Search And Rescue Association navigator and spotter, and I tell you the truth. Flares are best at night, and worthless in the day. For days, get yourself a signal mirror, any outfitter has them. Can be seen from the air from 40km away, truth. Far more effective. It has to be a real mirror, though, not a CD. CDs look good in your hand, but they scatter more light than they reflect and are nowhere near as bright as a mirror. Even those cheap camping mirrors are better.
Carry flares for fun, for firestarting, or for night work (still have to clear the treetops, of course) but carry a signal mirror if you expect to be found.