An overrun is the dive you did not plan: the bottom held a few minutes longer, or a few metres deeper, than the plan says. The Contingency card re-plans the dive for each overrun you name. The primary schedule never moves; every overrun is computed beside it.
Each row re-plans the dive with the bottom stayed that row's extra time and depth longer than planned - the primary schedule itself never moves. Each overrun carries its own loss-of-deco set. Scenarios appear in the Review step's scenario picker.
The fields
- Contingency: on or off. A plan arrives with it on and two rows in place, +5 min / +3 m and +5 min / +6 m. Switch it off and it stays off for that plan, and no overrun is computed.
- +min over: minutes added to the planned bottom time.
- +m over: metres added to the planned depth.
Each row carries its own remove control, and a new row starts at +5 min / +3 m. The planner holds at most six rows; at six the add control is disabled and says so. A row with both fields at zero computes nothing.
In the Review step
Each row appears in the Review step’s scenario picker as its own group, labelled by its numbers: “+5 min / +3 m”. On a closed-circuit plan every overrun carries a full bailout set of its own, which answers the question the card exists for: if the dive runs over and you then have to bail, is the bailout gas still enough? On open circuit each overrun carries its own set of lost-deco-gas ascents instead.
Read an overrun’s figures from the group’s own row, named Loop +5 min / +3 m on a rebreather and OC +5 min / +3 m on open circuit, then select the ascents grouped under it, each named with the overrun’s numbers before its own; every one is a complete plan with its own schedule, gas figures and warnings.
Next
Descent and ascent rates is the next card. For what the scenario picker shows on the dive as planned, see the Review step.