DESCENT MK2/MK2S Owner’s Manual

CCR Data Screens

Primary data screen: Displays the main dive data and your rate of ascent or decent.

Indicates whether closed-circuit (CC) or open-circuit (OC) diving is active.

Your partial pressure of oxygen (PO2) level.

Your nitrogen (N2) and helium (He) tissue load level.

Green: 0 to 79% tissue load.

Yellow: 80 to 99% tissue load.

Red: 100% or greater tissue load.

Your rate of descent or ascent.

Green: Good. Ascent is less than 7.9 m (26 ft.) per min.

Yellow: Moderately high. Ascent is between 7.9 and 10.1 m (26 and 33 ft.) per min.

Red: Too high. Ascent is greater than 10.1 m (33 ft.) per min.

Dive compass: Allows you to view the compass and set a directional heading to aid with underwater navigation (Navigating with the Dive Compass).

Customizable data screen: Displays additional dive data and physiological information, including the time of day and battery level. You can edit the gauges and the first five data fields (Customizing the Data Screens).

The time to surface (TTS) decompression calculation.

Your central nervous system (CNS) oxygen toxicity level.

Green: 0 to 79% CNS oxygen toxicity.

Yellow: 80 to 99% CNS oxygen toxicity.

Red: 100% or greater CNS oxygen toxicity.

Your current oxygen toxicity units (OTU).

Green: 0 to 249 OTU.

Yellow: 250 to 299 OTU.

Red: 300 or greater OTU.