NAUI Advanced Scuba Diver
52 Introduction to Deeper Diving
FIGURE 5-3. Dive computers also use a variety of designs with many different features. One benefit is the accuracy and reliability of information
that is automatically recorded.
The best accuracy is usually achieved with a dive computer
(figure 5-3). A dive computer is not only more accurate,
it also continually monitors your dive status and provides
essential information including remaining dive time
based on calculations of your absorbed nitrogen levels.
Dive computers help divers avoid decompression
sickness by providing reliable and accurate measures of
depth and time. If you use a dive computer, it is important
to have read the manufacturer’s instructions for its
use. It is also a good idea to have used the computer on
shallower dives to familiarize yourself with its operation.
It is essential that each member of the dive team be
able to independently monitor his or her own depth and
dive time, whether with a depth gauge and a watch or
timer or with a dive computer. Sharing depth and time
instruments with your dive buddy is risky and should be
avoided on all dives regardless of depth.
Another useful, but not critical, instrument is the
compass. The ability to use the compass to navigate effectively
underwater can be valuable on deep dives. It is not
easy or wise to surface for bearings, therefore, a compass
for each diver is recommended as well as competency in
its use.
Having extra cylinders available for deep dives is
highly recommended. Divemasters sometimes place an
extra cylinder with an attached regulator in the water to
FIGURE 5-4. Having extra cylinders available for deep dives is
recommended. They can easily be deployed from
decompression bars.