The unit comes with electronics similar to the Ouroboros with a
different human-computer interface (HCI).
There are two HUD's, one front and one rear. A Primary display
and a Backup display.
All the electronics, solenoid and batteries are outside of the
The Primary display connects to the Core Life-Support Module in
the canister head via a cable. The Primary does not contain any
system control electronics and is just a display. The Core
Module provides life-support and decompression status.
The HUD's, Backup display and HP sensors also connect into the
Electronic failure of any display will not affect life-support
The HUD on a level one unit has 3 states.
Green - All OK
Amber - Your consumables are running low, slowly ascend towards
the surface on closed circuit (often this alarm will go away on
Red - Perform open circuit bailout now. You will then be
prompted to switch the Primary to open circuit decompression.
The HUD on a level 2 & 3 follows the Ouroboros logic and gives
additional information on decompression, PO2, solenoid status
and general alarms.
All HUD's have visual and tactile alarms. The tactile alarm only
sounds at extreme alarm levels to reduce 'alarm blindness'.
To activate the unit the user can do so in three ways.
1. By switch on the Primary (the pre-dive sequence check-list
will then automatically start)
2. By entering the water and getting to depth (1.3m approx.). A
pre-dive abort alarm sound and be logged.
3. By breathing the unit on land or in the water. This final
'auto-breathe' function is the primary fail-safe. The unit will
turn on when it senses breathing and provide a minimum
life-support (irrespective of setpoint) of 0.4 PO2.
The Primary and Backup come with a colour screen. The VGM
decompression algorithm is available as an option.