Hollis Explorer User Manual - page 74
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Getting Ready To Dive
gear prep
WEIGHTING
As the counterlungs inflate, the diver may experience movement in the
EXPLORER. This is minimized by tightening the harness or adding trim
weights to the pocket available on the top of the case. A weight of up to
2-3 kg/4.4-6.6lbs can be used.
If the EXPLORER is allowed to move on the diver's back, a change in
breathing resistance may be noted. With the Explorer’s back mounted
counterlungs it is important that the Explorer is as close to the diver’s back
as possible.
Your instructor will teach you how to weight yourself correctly.
! WARNING: Over-weighting is dangerous. With an empty BCD, no
additional bailout cylinder and 50 bar/735 PSI in the main cylinder
you should be able to begin slowly to submerge in a controlled
fashion by exhaling slightly (too much exhalation and the ADV will
add gas upon the next inhalation).
! WARNING: It is important to perform weight checks in confined
shallow water with at least 50 bar/735 psi bailout gas prior to any
open water diving.
HARNESS/BCD POSITIONING
When adjusting the harness try and imagine that the center of the count-
er-lungs should be within ± 100 mm/4 inches of the tip of your sternum
to give an optimum breathing performance. While the BCD/harness must
be comfortable it should not be loose. The harness will sit differently on
land compared to when you are in the water.
OCTOPUS, BAILOUT, & CYLINDER CONFIGURATIONS
Exact gas requirements for any type of diving are a matter of personal
choice; they are predicted by specific level of EXPLORER certification and
training agency.
!
DANGER: It is vital that a breathable open circuit bailout is carried
at all times for all depths of the dive, of sufficient volume to allow
for a safe ascent to the surface at a stressed breathing rate.