DISCLAIMER :
ZH16B is a DM15L/DM15 deco program that is given for
educational purpose only (RPN deco calculations)
IT SHOULD NOT BE USED TO PLAN YOUR DIVES...
... although it gives same results (around 99%) as
MULTIDECO ANDROID commercial planner!
===============================================
Version changes :
- 10/08/2021 : First release with only Air/Nitrox mixes, deco mix changes and surface intervals
Introduction :
This is the first version of a RPN deco planner for the DM15L/DM15 using the Buhlmann algorithm, the ZH16B algorithm to be precise.
(https://en.m.wikipedia.org/wiki/B%C3%BC ... _algorithm)
The Buhlmann ZH16B algorithm uses a base of 16 M-Values (A and B) for Nitrogen decompression TABLES.
The program also uses Erik Baker's gradient factors when computing ceiling using Nitrox (https://wrobell.dcmod.org/decotengu/model.html)
KNOWN LIMITATIONS : (beware that some are voluntary limitations)
- this program runs only on DM15L_M1B and DM15_M1B because it needs a lot of memory and program steps
- this version is using Air/Nitrox mixes only (there is not enough memory space in the DM15_M1B platform to include Helium mixes)
- the program is METRIC only (but is it really a limitation )
- the program is limited to 99 meters and 999 minutes
- deco is calculated at sea level in fresh water (but internal data can be changed to accommodate altitude diving in fresh water)
- descent speed is 20m/min, ascent speed is 10m/min, between stops speed is 10m/min (but internals can be changed to accommodate any speed)
- gradient factor is between 0,3 and 0,85 (but internals can be changed to accommodate other values)
- there is NO CHECK on valid/invalid gaz usage in this version. Narcosis and High/Low Oxygen levels are still managed by the computer available between your ears!
DIVE MODEL :
A dive is modeled by a succession of flat segments (or legs), an ascent to the first deco stop, and deco stops until surface is reached.
You can add as many flat segments as you need to model your dive, each segment with it's own diving mix.
Once you decide to "call the dive", the program calculates the ascent to the first deco stop, first deco stop duration and each successive stops duration until surface is reached.
Deco can also be done with different deco mixes, you can change deco mix at the end of any stop.
When at surface, you can add a surface interval, then a second dive.
WARNING :
1) As usual during the dive (with travel/bottom mixes)...
- Descent time in INCLUDED in segment time and is retrieved form time spent at depth
- Ascent time is EXCLUDED in segment time and time spent at depth is unchanged
- you change mix once arrived at the flat portion of the segment
2) As usual during deco stops (with deco mixes)...
- Ascent time to the following stop is included in following deco stop time
- deco mix is changed at the bottom and ascent to first stop is done with deco mix
HINTS :
A) Bottom/Travel or Deco Mix change :
You can always force a mix change, at any point of the dive, inserting a "0 minute" segment during the dive when prompted with "(?)"
Example :
Y = oo.000 new mix (oo = 02% in the mix)
X = dd.000 where dd is current depth with 0 minutes
Then hit R/S to compute the dive
B) Message prompt is in the imaginary part of the display
When complex "C" annunciator is on, a prompt code/message is available in the imaginary part.
You can read the "prompt code" keying (f) (i) displaying temporarily imaginary part of X.
Prompt code/message table :
"1111" => "At surface, key in first segment or surface interval"
"2222" => "Descending, hit R/S to continue"
"3333" => "At depth, key in additional segment or call the dive"
"4444" => "Ascending, hit R/S to continue"
"8888" => "Stop, hit R/S to go to next stop or key in new deco mix"
"9999" => "Surface reached, hit R/S to continue"
C) Each segment is keyed in as this :
1) the mix used for the segment in Y as oo.000, oo being the O2 percentage in the mix (21.000 for air, 32.000 for a 32% Nitrox, 50.000 for a 50% deco mix, 100.000 for 100% Oxygen deco gas for example)
2) the next diving segment in X as dd.mmm, dd being the depth reached in meters and mmm being the duration in minutes of the dive segment (duration INCLUDING descent time and EXCLUDING ascent time)
3) then you hit "R/S" to add the segment to calculations
D) 2 results are show when adding a segment :
1) First result is ascent/descent management to targeted depth shown with a "2222" or a "4444" message in imaginary part of display
- total diving time in Z, often called RUN time (in minutes)
- current mix used by program in Y (as oo.000)
- dd.mmm in X, depth as dd and mmm as real time spent in ascent/descent ONLY
Hit "R/S" to continue (as shown in ALHPA message)
2) Second result is time spent at depth shown with a "3333" message in imaginary part of display
- total diving time in Z (in minutes)
- current mix used by program in Y (as oo.000)
- dd.mmm in X, depth as dd and real time spent at depth in mmm (time spent in ascent or descent from previous depth is removed from segment time)
E) You can add as many segments as you need to simulate your dive.
For each segment the program replies with
- the ascent/descend time if it exists (not a flat segment)
- the segment time
F) "Calling the dive" or computing the deco stops
When you "call the dive", you have to key :
- the first mix used during deco in Y as oo.000 (see explanation up somewhere)
- 0.000 in X because you are asking to reach the surface (0 meters asked as next depth)
- then hit R/S to calculate first deco stop
1) You get first an ascent to the first deco stop, then as many information as there is stops in the deco (every 3 meters)
1.1) First the result is ascent to the first stop with a "4444" message in imaginary part of display
- total dive time still in Z (in minutes)
- Mix used during deco in Y (as oo.000)
- dd.mmm in X, dd as depth of first deco stop and mmm as duration of the first stop INCLUDING ascent time from last segment
Hit R/S to continue and get all the deco stops informations
1.2) Following results are all the deco stops
- total dive time still in Z (in minutes)
- Mix used during deco in Y (as oo.000)
- dd.mmm in X, dd as depth of deco stop and mmm as duration of the first stop INCLUDING ascent time from last stop
1.3) after each stop you have two choices
1.3.1) You either hit R/S to continue the deco with the same mix,
1.3.2) Or you enter a new deco mix
- the new mix used during deco in Y as oo.000 (see explanation up somewhere)
- 0.000 in X because you are still asking to reach the surface
- then hit R/S to calculate next deco stop with new deco mix
G) Reaching surface, surface interval and second dive
When you reach 0m you get a "9999" message summing the dive in imaginary part of display
- Z is showing total run time (in minutes)
- Y is showing the last deco mix
- X is showing 00.000
- then hit R/S to finish the dive and start from 0 either for a surface interval or a new dive
You get a "1111" message in imaginary part of display
- Z is showing 0.000 (ready for either a surface interval or a new dive)
- Y is showing 21.000 (at surface we breath air)
- X is showing 00.000 (we are at 0m)
You can add a surface segment with 0.mmm where 0 is for surface and mmm the surface interval or a second dive segment
EXAMPLE OF A DIVE :
You want to plan the following dive :
- Segment 1 : 30 minutes at 30m with air
- Segment 2 : 30 minutes at 20m with 32% Nitrox
- Then you call the dive USING a 50% Nitrox mix for deco
- At 6m stop, you SWITCH to 100% Oxygen deco mix
Launch "zh16b" program available as LBL A
you get a "1111" message in imaginary part of display
21.00 (air as travel/bottom mix)
ENTER
30.030 (30m, 30 minutes)
R/S
you get a "2222" message in imaginary part of display with
Z = 1.5 min (RUN time)
Y = 21.00 (air used)
X = 30.002 (2 minutes descent time from surface to 30m)
HIT R/S
you get a "3333" message in imaginary part of display with
Z = 30 min (RUN time)
Y = 21.00 (air used)
X = 30.029 (29 minutes spent at 30m depth)
You key in
32.00 (new travel/bottom mix)
ENTER
20.030 (20m, 30 minutes)
R/S
You get a "4444" message in imaginary part of display
Z = 31 min (RUN time)
Y = 21.00 (air used up to next flat segment)
X = 20.001 (1 minutes ascent time from 30m to 20m)
HIT R/S
you get a "3333" message in imaginary part of display with
Z = 61 minute (RUN time)
Y = 32.00 (32% Nitrox used)
X = 20.030 (30 minutes spent at 20m)
You key in
50.00 (we switch to a 50% Nitrox mix for deco)
ENTER
0 (request deco stops computing)
R/S
you get a "4444" message in imaginary part of display with
Z = 62.1 (RUN time)
Y = 50.00 (50% Nitrox used)
X = 9.001 (first stop is 9m and one minute ascent between 20m and 9m)
HIT R/S
you get a "8888" message in imaginary part of display with
Z = 63 (RUN time)
Y = 50.00 (50% Nitrox used)
X= 9.001 (first stop is 9m and one minute stop at 9m, including the ascent time)
You key in
100.00 (we switch to a 100% Oxygen mix for deco)
ENTER
0 (request following deco stops computing)
R/S
you get a "8888" message in imaginary part of display with
Z = 64 (RUN time)
Y = 100.00 (100% Oxygen used)
X = 6.001 (next stop is 6m and one minute stop at 6m, including the ascent time)
HIT R/S
you get a "8888" message in imaginary part of display with
Z = 69 (RUN time)
Y = 100.00 (100% Oxygen used)
X = 3.005 (next stop is 3m and 5 minutes stop at 3m, including the ascent time)
HIT R/S
you get a "9999" message in imaginary part of display with
Z = 69 (RUN time)
Y = 100.00 (100% Oxygen used)
X = 0.000 (you reached surface)
HIT R/S
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Code: Select all
DM15_M1B
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S: 00000000000000
M: 00000000000000 N: 00000000000000 G: 03