SPECIAL
DIVE TABLE AND COMPUTER PROCEDURES
In
Section Four you learned the basics
for diving with dive tables and dive
computers, but there are some additional
procedures that you need to know about.
These involve procedures for enhanced
safety, for accidentally exceeding your
no-stop limit, and for diving at altitude
or ascending to altitude after diving.
Safety
Stop
Although
as a recreational diver you plan only
no decompression dives that allow you
to ascend directly and continuously
to the surface, most of the time you'll
want to make a safety stop for added
conservatism. A safety up provides extra
time for your body to eliminate nitrogen,
and it gives you a moment to stabilize
and control your ascent tie before continuing
to the surface.
To
make a safety stop, you stop your ascent
the 3 to 6 metre/10 to 20 foot range
usually at 5 metres/15 feet for three
minutes or longer. It's easiest to do
this holding into or on an ascending
slope, but you can also hover in midwater
where appropriate.
You
plan your dive so you can make a safety
stop and still reach the surface with
20-40 bar/300-500 psi or more air remaining
in your cylinder.
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