SUUNTO SPYDER User Manual

Page 19

Higher Risk Dive Profiles
The user must understand that all decompression

devices (decompression tables and/or dive com-

puters) are based on mathematical models and

that many experts are currently concerned that

these models may not under certain conditions

adequately describe the physiological phenom-

ena. These conditions are presently identified as

dives which incorporate the following:
·

REVERSE PROFILES where the diver

spends most of the dive at shallow depths

and then descends to the maximum depth

shortly before surfacing.

SAWTOOTH PROFILES where the diver

alternates between greater and shallower

depths repeatedly throughout the dive.

CONSECUTIVE DIVES where the diver

performs repetitive dives to approximately

the same maximum depth with only short

surface intervals between dives. The risk of

decompression sickness increases when

depth and the number of repetitive dives in-

crease and when the surface intervals are

shortened.

Fig. 2.1 Reverse profiles.

Fig. 2.2 Sawtooth profiles.