Chemicals: Potassium permanganate is an example of a chemical that can
be used to make a temporary sign on water or a more permanent one in
snow (it dyes the snow purple) to signal for rescue.
Chemical lights: Although some companies make chemical lights for sur
vival situations, these are not very bright and usually can’t be seen from
more than a mile away. Chemical lights are most easily seen when swung
in wide arcs or sweeps; all have a limited storage life that runs out quickly
after exposure to air.
Flares: Flares are an effective way to signal someone and they have saved
lives all around the world. They work only for a short time, however, so
don’t use them until you’re sure they’ll be seen.
Flashlight: These don’t have the same range as signal mirrors but work in
the same way and are very useful at night. Be careful not to waste battery
power; there’s no point dangling your flashlight in a tree all night unless
there’s a chance someone may see it.
Laser flares: Take flashlights one step further, with a more powerful, color
ful, and visible beam and you’ve got the laser flare. Another benefit of laser
flares is that they’re compact and longlasting.
Signals You Make Yourself
If you’re not fortunate enough to have a readytouse signal on hand, there
are still a few signaling options available. These can be as effective as the
readytouse variety, but require more effort and are subject to the vagaries
of your environment.
(^58) | Survive!