Older maps and charts had large white spaces marked 'unexplored' in recent times or 'here lie Dragons' more distant. The portugese sailors exploring Africa simply erected large crosses visible from offshore. A crew would sail so far seeing crosses and then be goaded by the captain 'lets sail just a few miles further.' Of course then they had to go ashore and erect another lousy cross before turning for home. Getting people prepared is like those crosses. If you can get a flashlight on a keychain a SAK and bic lighter in purse or pocket and water in the car trunk may follow.