jbop65...a lot of good advices already given so I will not repeat them. However, here is a very good example of what could easily be two multi-level dives...using either the wheel or the ERDPml.
This is what I got using my son's eRDPml: 120 ft (NDL 13 mins) 10 mins (including descent) PG G:
80 ft (NDL 13 mins) 2 mins PG H,
60 ft (NDL 22 mins) 2 mins
Safety Stop 3 mins a 15 ft...required. PG after dive I
Surface Interval 1h30 mins: PG B
Dive 2:
100 ft (NDL 14 mins) 10 mins (including descent) PG H,
60 ft (NDL 17 mins) 5 mins PG N,
40 ft (67 mins) 5 mins PG P.
Now...you need to consider your SAC (Surface Air Consumption) let's use .75cft/min:
120 ft = 4.64 ATM, 100 ft = 4 ATM, 80 ft = 3.42 ATM, 60 ft = 2.82 ATM, 40 ft = 2.21 ATM, 15 ft = 1.45 ATM
Dive 1...34.8 cft + (1.33 mins climb = 4 cft) + 5.13 cft + (.66 mins = 1.55 cft climb) + 4.23 cft + ( 1.5 mins climb = 2.0 cft) + 3.3 cft + (30 secs climb = .4 cft) up time from 15 ft= 55.5 cft or about 2100 psi out of a 3000 psi 80 cft tank...all that to say that it should be feasible if your SAC rate hovers around .75 cft.
Dive 2: 30 cft + (1.33 mins = 3.5 cft climb) + 10.6 cft + (.66 min = 1.25 cft) + 8.3 cft + (.8 min = .8 cft climb) + 3.3 cft + (30 secs climb = .4cft) = 58.15 cft or 2180 psi out of a 3000 psi 80cft tank.
Nitrox vs air... if your SAC hovers around .75cft/minand you are using a 80cft tank...your limiting factor for the above-mentionned profiles (Multi-level dives) will end up being ...the size of your tank as you will run out of gas before you run out of NDL ...(as an example you could have easily stayed 10 mins (instead of 2 mins) at 80 ft and 10 mins (instead of 2 mins) at 60 ft but this would have required an additional 37 cft for Dive 1...thus necessitating, as a minimum a 100 cft tank for the dive).
This is what I got using my son's eRDPml: 120 ft (NDL 13 mins) 10 mins (including descent) PG G:
80 ft (NDL 13 mins) 2 mins PG H,
60 ft (NDL 22 mins) 2 mins
Safety Stop 3 mins a 15 ft...required. PG after dive I
Surface Interval 1h30 mins: PG B
Dive 2:
100 ft (NDL 14 mins) 10 mins (including descent) PG H,
60 ft (NDL 17 mins) 5 mins PG N,
40 ft (67 mins) 5 mins PG P.
Now...you need to consider your SAC (Surface Air Consumption) let's use .75cft/min:
120 ft = 4.64 ATM, 100 ft = 4 ATM, 80 ft = 3.42 ATM, 60 ft = 2.82 ATM, 40 ft = 2.21 ATM, 15 ft = 1.45 ATM
Dive 1...34.8 cft + (1.33 mins climb = 4 cft) + 5.13 cft + (.66 mins = 1.55 cft climb) + 4.23 cft + ( 1.5 mins climb = 2.0 cft) + 3.3 cft + (30 secs climb = .4 cft) up time from 15 ft= 55.5 cft or about 2100 psi out of a 3000 psi 80 cft tank...all that to say that it should be feasible if your SAC rate hovers around .75 cft.
Dive 2: 30 cft + (1.33 mins = 3.5 cft climb) + 10.6 cft + (.66 min = 1.25 cft) + 8.3 cft + (.8 min = .8 cft climb) + 3.3 cft + (30 secs climb = .4cft) = 58.15 cft or 2180 psi out of a 3000 psi 80cft tank.
Nitrox vs air... if your SAC hovers around .75cft/minand you are using a 80cft tank...your limiting factor for the above-mentionned profiles (Multi-level dives) will end up being ...the size of your tank as you will run out of gas before you run out of NDL ...(as an example you could have easily stayed 10 mins (instead of 2 mins) at 80 ft and 10 mins (instead of 2 mins) at 60 ft but this would have required an additional 37 cft for Dive 1...thus necessitating, as a minimum a 100 cft tank for the dive).