Owners manual

20
HYPOTHERMIA
Prolonged exposure to cold water causes a condition known as
hypothermia - a substantial loss of body heat, which leads to
exhaustion and unconsciousness. Most drowning victims first
suffer from hypothermia. The following chart shows the effects of
hypothermia: how hypothermia affects most adults.
How hypothermia affects most adults
Water Temperature ˚C (˚F) Exhaustion or
Unconsciousness
Expected Time of Survival
0.3 (32.5) Under 15 min. Under 15–45 min.
0.3–4 (32.5–40) 15–30 min. 30–90 min.
4–10 (40–50) 30–60 min. 1–3 hrs
10–16 (50–60) 1–2 hrs. 1–6 hrs.
16–21 (60–70) 2–7 hrs. 2–40 hrs.
21–27 (70–80) 2–12 hrs. 3 hrs. to Indefinite
over 27 (over 80) Indefinite Indefinite
PFDs can increase survival time because they allow you to float
without using energy treading water and because of their insulating
properties. Naturally, the warmer the water, the less insulation you
will require. When operating in cold waters [below 60°F (15.6°C)] you
should consider using a coat or jacket style PFD or a Type V Thermal
Protective PFD as they cover more of the body than the vest or belt
style PFDs. Some Points to Remember About Hypothermia Protection:
1) Always wear your Inflatable PFD. Even if you become
incapacitated due to hypothermia, the Inflatable PFD will keep you
afloat and greatly improve your chances of rescue.
Figure 15
2) Do not attempt to swim unless
it is to reach a nearby craft,
fellow survivor, or a floating
object on which you can lean
or climb. Swimming increases
the rate of body heat loss. In
cold water, drown-proofing
methods that require putting
your head in the water are not
recommended. Keep your head
out of the water. This will
greatly lessen heat loss and
increase your survival time.