The Optima CM includes a Shearwater HUD (Heads-Up Display). The HUD displays the PPO readings of oxygen sensors 1, 2, and 3H. These values are displayed using three columns of LEDs. Each column represents a different sensor. The colored LEDs flash using a modified Smither’s code to convey the PPO2 values. A “color blind” mode is also available. The HUD can be setup for right or left eye operation. The HUD can be turned on manually by pressing the button on the end of the housing. There are also wet contacts which automatically turn the unit on in case it was not turned on prior to the dive.
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Your life depends on always knowing the PPO2 in the breathing loop while diving a rebreather. Do not make
assumptions about how the HUD displays PPO2 values. Previous versions of the HUD used different blink patterns. Refer to the latest Shearwater HUD User Manual for a detailed description of the HUD blink pattern and operation.
The Shearwater NERD 2 (Near Eye Remote Display) is also available as an option. (https://www.shearwater.com/products/nerd-2/) The NERD 2 replaces the standard HUD providing a numerical readout of the 3 sensor PPO2 values and also serving as a backup computer with fully redundant decompression and dive information. Dive Rite now offers a controller version of the NERD 2 which allows full set-point control without using a separate Petrel 2 controller. Contact Dive Rite for more information.
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