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Sherwood Courier CR100 Manual

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4COURIER OWNER’S MANUAL
1.0 Introduction
This information has been developed for your safety.
Please read and understand this manual completely
before using your new Sherwood dive computer.
1.1 Simply Reliable
Congratulations! You are now the owner of a new
Sherwood Scuba dive computer. You’re about to experi-
ence the Sherwood difference in diving equipment—
products that are simply reliable. At Sherwood, we
focus on the type of diving you do, then design products
that address your specific needs. The simple, purposeful
designs of all Sherwood equipment provide you with reli-
able, trouble-free performance, dive after dive.
1.2 Key Features
Among the Courier’s key features:
■■The Courier fits Sherwood’s CNC-3™ Compact
Navigational Console. This console combines the
Courier with an analog submersible pressure gauge
(SPG) and easy-to-use top- and side-reading compass.
The console also features clip anchors on either side, to
help attach it to your BC. The Courier computer mod-
ule will also fit in most other standard instrument con-
soles and circular wrist mounts.
■■The Courier activates automatically upon descent. It
need not be manually activated prior to entering the
water (although we recommend doing so).
■■It automatically adjusts for altitudes up to 7,882
ft/2,400 m, and is capable of functioning at depths up
to 328 ft/100 m.
COURIER OWNER’S MANUAL 5
■■The Courier displays a variety of data, including date,
time of day, current, max and average depths, no-
decompression dive time elapsed and remaining, and
water temperature.
■■The Courier provides visible alarms for violation of
ascent rate, no-decompression status and mandatory
decompression stops.
■■If needed, the Courier can calculate deco requirements
for stops as deep as 39 ft/12 m.
■■The Courier’s Random Access Memory (RAM) enables it
to hold and display log data on ten dives.
■■Depending on use, the Courier’s battery can last up to
several years before needing replacement. Battery
replacement may be done by an authorized Sherwood
dealer, or by the consumer, following the instructions
appearing in this manual.
1.3 Common Sense Warnings
As is true of every piece of diving equipment—including
all dive computers—the Courier’s abilities are not limitless.
Thus, there are certain limitations and restrictions of
which you must be aware, and certain precautions you
must take, when using the Courier.
Before using your Courier, it is extremely
important you read the following points—as
well as similar warning and caution notices
that appear throughout this manual—and fol-
low the recommendations they provide.
Failure to do so could result in damage to or
loss of equipment, serious personal injury
or death.
6COURIER OWNER’S MANUAL
■■The Courier is designed for use by certified, recreational
divers who have maintained a sufficient level of knowl-
edge and skill proficiency through a combination of for-
mal training, ongoing study and experience. It is not
intended for use by persons who lack these qualifica-
tions and, thus, may not be able to identify, assess and
manage the risks scuba diving entails.
■■The Courier is not intended for use by commercial, mili-
tary or technical divers, whose activities may take them
beyond the commonly accepted depth limits for recre-
ational diving.
■■The Courier is designed for use by divers breathing nor-
mal compressed air. It does not provide a means of
tracking exposure to the elevated partial pressures
divers may encounter when breathing Enriched Air
Nitrox (EANx).
■■Although the Courier is capable of calculating decom-
pression stop requirements, this ability is provided as a
safety feature only, should recreational divers accidental-
ly exceed the No-Decompression Limits (NDLs). Dives
requiring mandatory stage decompression carry sub-
stantially greater risk than dives made well within no-
decompression limits. Divers should not use the Courier
to plan or execute dives that will intentionally exceed
no-decompression limits.
■■The Courier is designed to be used by only one diver at
a time. Divers should not share a single Courier—or
any other dive computer—on the same dive.
Additionally, no diver should lend his or her Courier to
anyone else until it calculates that no measurable resid-
ual nitrogen remains after previous dives, and is able to
enter its Sleep Mode. Further, no diver should use his or
her Courier for repetitive dives—unless that same
Courier has accompanied him or her on all previous
dives in the same repetitive dive series.
COURIER OWNER’S MANUAL 7
■■Neither the Courier—nor any other dive computer
presently available—physically measures the amount of
nitrogen present in body tissues, or the rate at which
this nitrogen is being absorbed or released. Instead, the
Courier monitors depth and time, and uses this data to
work a mathematical formula designed to emulate how
individuals in good general health and whose physical
characteristics do not place them among those at high-
er risk of decompression illness are assumed to absorb
and release nitrogen from body tissues. Thus, the
Courier cannot compensate for factors such as age,
obesity, dehydration, cold or exertion, which experts
believe place divers at greater risk of DCI. If these, or
similar factors apply to you, use the Courier—and any
other dive computer or dive table—with even greater
caution.
■■Experts still know surprisingly little regarding the exact
nature and causes of decompression illness (also known
as decompression sickness, DCI or DCS). Susceptibility to
DCI may vary substantially from person to person and
from day to day. Neither the Courier—nor any other
dive table or dive computers—can guarantee that you
will not suffer decompression illness. Even though you
use these items correctly, you may still suffer DCI. Use
your Courier conservatively, and in conjunction with
other dive planning devices, such as dive tables. Do not
rely on the Courier, or any similar device, as your sole
means of avoiding decompression illness.
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