Breathing mode is a property of the plan, set when the plan is created. In the New dive plan dialogue, the Breathing Mode control offers Open Circuit and Rebreather (CCR). Choosing Rebreather (CCR) puts the whole plan on the closed-circuit path; there is no per-dive toggle further in.
What changes in CCR mode
- The Plan step’s section rail gains a CCR entry, between Environment and ICD Safety, holding Setpoint Settings, the loop’s own gas cards and Scrubber. The bailout rates sit with the other consumption rates, in Work Rates.
- The gas wizard offers five closed-circuit roles in place of bottom, travel and deco gas: Onboard Diluent, Onboard Oxygen, Offboard Diluent, Bailout and Diluent + Bailout. See Gas roles.
- Every step of the dive is planned on the loop mix implied by the active setpoint rather than on a cylinder gas; gradient factors, algorithm and rates are unchanged.
- With air breaks enabled, a Break Setpoint field appears; the planner holds the loop there for the break instead of switching gas.
- The Review step gains a Scenarios control above the profile chart in the Overview, Schedule, Gas and Tissues views. See Bailout scenarios.
The smallest plan that runs
Two gases, in two roles. The plan arrives with a 3 L Onboard Oxygen cylinder at 200 bar already listed: the unit’s oxygen supply, never breathed and counting toward neither role. Remove it and it stays removed.
- One Onboard Diluent, mandatory. Without it the planner refuses to run and
reports
CCR mode requires an Onboard Diluent gas to be configured. - At least one open-circuit-capable gas, in the Bailout or Diluent +
Bailout role. The loop schedule computes without one; bailout planning does
not, and returns
Add an OC bailout or diluent bailout gas to plan bailout scenarios.in place of the scenario picker.
The dive the rest of this section uses is 55 m for 30 minutes on a 21/35 diluent, with 21/35 as diluent bailout and 50 % as an open-circuit bailout gas, setpoints 0.7 on descent and 1.3 from 30 m.