Oceanic OCS, Operating Manual

Page: 47 / 62

47
OCS OPERATING MANUAL
© 2002 Design, 2011 Doc. No. 12-5272-r01 (9/28/11)
ADDITIONAL INFORMATION PERTAINING TO FREE DIVE MODE
Although breathing apparatus is not utilized for FREE Dive activities, nitrogen tissue loading remains a
factor. Nitrogen loading is calculated based upon a fixed FO2 of AIR.
Since a user has the option of alternating between NORM (SCUBA) and FREE Dive activities within a 24
hour period, nitrogen calculations and the displayed value of No Deco Dive Time Remaining (NDC Time)
are carried over from one operating mode to the other, which permits the user to maintain awareness of
nitrogen absorption and offgasing status.
The mathematical models currently used in the OCS are based on no decompression/decompression
multilevel repetitive dive schedules.
These algorithms do not take into account the physiological changes associated with the high pressures
that competitive type Free diving can expose a diver to.
Fig. 142A - FREE VIOLATION
(entry into Deco, during Aud)
Fig. 142B - FREE VIOLATION
(after Aud)
Fig. 143 - FREE VIOLATION
(6 sec on surface)
Fig. 141 - TLBG AL
High Nitrogen Alarms
When nitrogen increases to the caution level (4 segments), the Audible will sound during which time the TLBG and Up Arrow icon
will flash on the Main (Fig. 141).
The Up Arrow icon remains on the display until on the surface.
In the event that nitrogen continues to increase and reaches the Deco level (Fig. 142A); all 5 TLBG segments, the Up Arrow icon,
and the graphic VIOL, will flash while the Audible sounds. NDC will be displayed as 0:00.
When the Audible is silenced, the TLBG and NDC are removed (Fig. 142B). The Up Arrow icon flashes until on the surface and
the graphic VIOL flashes (Fig. 143) until 1 minute elapses on the surface.
After 1 minute on the surface, the graphic VIOL alternates with FREE and dive computer operation locks into FREE Mode for 24
hours. Access to Watch and Compass will be as usual.
WARNINGS
Ensure that you know which Operating Mode is selected (NORM, GAUG, or FREE) prior to commencing any
dive.
Conducting Free dives within a 24 hour period after conducting SCUBA dives, combined with the effects of
multiple rapid Free Dive ascents, increases your risk of decompression sickness. Such activities may result in
accelerated entry into decompression which could cause serious injury or death.
Combining competitive type Free dive activities that involve multiple descents/ascents with activities utilizing
SCUBA during the same 24 hour period is not recommended. Presently, there is no data relating to such
activities.
It is highly recommended that anyone planning to become involved in competitive type Free dive activities
obtain proper instruction and training from a recognized Free Diving trainer. It is imperative that the
physiological affects be understood and the diver is physically prepared.