I see a lot of minutes and counting in that, Trace.
R..
Not really. It's pretty straightforward.
Let's take a 200 foot dive for 25 minutes on 18/45 with Nitrox50 and 100% oxygen for deco as an example.
If I use V-Planner the plan looks like this:
Decompression model: VPM - B
DIVE PLAN
Surface interval = 1 day 0 hr 0 min.
Elevation = 0ft
Conservatism = + 2
Dec to 200ft (4) Trimix 18/45 50ft/min descent.
Level 200ft 21:00 (25) Trimix 18/45 1.24 ppO2, 76ft ead, 95ft end
Asc to 130ft (27) Trimix 18/45 -30ft/min ascent.
Stop at 130ft 0:40 (28) Trimix 18/45 0.87 ppO2, 43ft ead, 56ft end
Stop at 120ft 1:00 (29) Trimix 18/45 0.82 ppO2, 38ft ead, 51ft end
Stop at 110ft 1:00 (30) Trimix 18/45 0.76 ppO2, 33ft ead, 45ft end
Stop at 100ft 1:00 (31) Trimix 18/45 0.71 ppO2, 29ft ead, 40ft end
Stop at 90ft 2:00 (33) Trimix 18/45 0.66 ppO2, 24ft ead, 34ft end
Stop at 80ft 2:00 (35) Trimix 18/45 0.60 ppO2, 19ft ead, 29ft end
Stop at 70ft 2:00 (37) Nitrox 50 1.53 ppO2, 32ft ead
Stop at 60ft 2:00 (39) Nitrox 50 1.38 ppO2, 26ft ead
Stop at 50ft 3:00 (42) Nitrox 50 1.24 ppO2, 19ft ead
Stop at 40ft 4:00 (46) Nitrox 50 1.09 ppO2, 13ft ead
Stop at 30ft 5:00 (51) Nitrox 50 0.94 ppO2, 7ft ead
Stop at 20ft 7:00 (58) Oxygen 1.59 ppO2, 0ft ead
Stop at 10ft 12:00 (70) Oxygen 1.29 ppO2, 0ft ead
Surface (70) Oxygen -30ft/min ascent.
Off gassing starts at 151.8ft
OTU's this dive: 89
CNS Total: 38.5%
141.1 cu ft Trimix 18/45
22.2 cu ft Nitrox 50
15.9 cu ft Oxygen
179.3 cu ft TOTAL
DIVE PLAN COMPLETE
In my notes, understanding what is happening and how I want to amend my dive to take advantage of certain theories from phase to phase, looks like this:
20 - 20
30 - 4
40 - 4
50 - 4
60 - 4
70 - 4
80 - 2
90 - 2
100 - 2
110 - 1
120 - 1
130 - 1
140 - 1
150 - 1
200 - 25
For this strategy all I need to know is my baselines for ratio deco, at what depth I'm at 75% of max depth, 50% of max depth, my gas switches and do I want to use O2 effect, what I want to do about the 30 foot stop regarding a back gas break, and then from 20 up it's old hat.