18
·
MULTIDAY DIVES. Repetitive dives per-
formed during several consecutive days.
·
DECOMPRESSION DIVES. Any dive dur-
ing which the no-decompression limit has
been exceeded or the diver is advised by
the computer that he may not return directly
to the surface.
Dive Computer Limitations
While the Spyder is based on current decom-
pression research and technology, the user/diver
must realize that the computer cannot monitor
the actual physiological functions of an indi-
vidual diver. All decompression schedules cur-
rently known to the authors, including the U.S.
Navy Tables, are based on a theoretical math-
ematical model which is intended to serve as a
guide to reduce the probability of decompres-
sion sickness.
The mathematical model uses a fixed ascent rate
of 10 m/min [33 ft/min] even at greater depths to
reduce the build-up of microbubbles, which can
grow larger and turn into harmful bubbles in a
later phase of the dive. Therefore it is critical
that a proper ascent rate is always used.
Fig. 2.3 Consecutive dives,
multiday dives.
Fig. 2.4 Recommended dive
profile.
