DCIEM Decompression Algorithm
DOC. 10055-DraftA (2021-07-21)
4
Computer Behavior
Shearwater computers using DCIEM operate in largely the same way as they do when
running any other decompression algorithm, though some info row displays will differ.
DCIEM is currently available for the Perdix, Petrel 2, Peregrine, and NERD 2. For basic
dive computer instructions, please see the primary operating instructions manual for
your model of computer.
DCIEM MAX
52
ft
DCIEM is currently only available in single gas open circuit
Air and Nitrox modes with a maximum oxygen fraction of
40%. Multi-gas, accelerated decompression and closed-
circuit diving are not currently supported.
A DCIEM indicator is displayed above the current oxygen
fraction on the home screen when DCIEM is enabled.
Divers who are accustomed to other decompression algorithms may be surprised at the
conservatism of the DCIEM algorithm. The built in NDL and decompression planners
will run DCIEM when enabled. This is a good tool for understanding the effects of the
algorithm on NDL and decompression requirements.
DCIEM Setup
An additional unlock fee is required to use the DCIEM algorithm. Contact your
Authorized Shearwater Dealer for more information on obtaining an unlock code.
To unlock DCIEM on your dive computer, enter the
unlock code in
System Setup > System Setup > Unlock
.
Your computer will restart, and all tissue information
will be reset. Manage repetitive diving accordingly.
Enable DCIEM in the
System Setup > Deco Setup
menu.
Changing to DCIEM from another algorithm will reset
the computer into Air diving mode if the current mode
is unsupported and decompression tissues will be
cleared. Plan repetitive dives accordingly.
Date 8-Aug-2015
Clock 12:28PM
Unlock
Log Rate 10 Sec
Reset to Defaults
Next
Unlock
System Setup
Deco Model
DCIEM
Safety Stop Adapt
Next
Edit
Deco Setup
Caution