Operating Instructions
Page 53
Doc. 15301-RevB (2023-11-24)
11.2. Deco Menu
The Deco Settings Menu
provides options for adjusting
the decompression algorithm�
Shown to the right of this
item are the currently
selected GF factors�
Like the Dive Settings Menu,
any settings changed in this
menu will only apply to the
Dive Mode you are currently
in�
Deco Model
This will just show
ZHL16C+GF indicating that
the Bühlmann ZHL-16 with
gradient factors model is
being used�
GF Conserv.
3 preset conservatism levels
are available� In order of
increasing conservatism:
• Low (45/95)
• Med (40/85)
• High (35/75)
Medium conservatism is the
default setting for all dive
modes�
A custom GF option is also
available in every dive mode�
When Custom is selected,
fields for editing GF Low and
GF High will appear in the
Deco Menu�
For a more detailed explanation of the GF algorithm
and the meaning of GF Low and GF High, please refer
to Erik Baker’s excellent articles: Clearing Up The
Confusion About “Deep Stops” and Understanding
M-values� The articles are readily available on the web�
Also see the Decompression and Gradient Factors
section on page 26�
Last Stop
Use this setting to identify where you plan to do your
last decompression stop� The choices are 3m/10ft and
6m/20ft�
This setting makes TTS predictions more accurate by
calculating according to planned last stop depth� It
does not affect real time decompression calculations�
Rate of decompression is related to the partial
pressure of inspired inert gas� If breathing a high
fraction of inert gas, the last stop depth may make a
significant difference to required decompression time�
If breathing pure O2, last stop will depth make no
difference as the fraction of inspired inert gas is zero�
This setting has no impact on safety stops� These are
governed by the logic described in the Safety Stops
section on page 24�
Settings
Dive|OC Rec
Deco|40/85
Gases
Deco
Deco Model
Last Stop
GF Conserv.
Med 40/85
3 m
ZHL16C+GF
4
4
4
GF Conserv.
Med 40/85
Low 45/95
High 35/75
Custom
✘
Deco
GF Conserv.
GF High
GF Low
40
85
Med 40/85
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