MV-Plan User Guide
Contents
1. ena 21 Biz AREE TIU 30 DECOMDIESSION DISCUSSION us teslis nerit dpa E XN pP epa to licis 30 Choosing Gradient factors esses nnne nnns 33 A Redlity AGC ON Tn 33 so ERE eeeeraniasccaans TEUER 34 DIVE POMC sao 34 Sas oca tue santansaacaveraameunastscaines seg auaaeaeatines nae aenie 35 Repetitive DIVES ooocooccconcconoconiconooncconocononononnnconocanonanonnnnnnnnanenanenons 36 WOOD al BUHONS scsi dica licita 3 Pete CMC cT TIPO 38 ADO DO E 41 Page 3 of 41 Index of illustrations Graphie 1 Java Veritas las 5 Graphic 2 CONGINOMS OF USO din 9 Graphic 3 Ereterences Dia od 10 Graphic 4 Gas Screen 11 Graphic 5 MV PIdA Maln SGIeelasesei xit ecd a ex d Free Orem UH aa 12 Graphic o Speciy DIVE Table uerum d nici Edd eek UO CERO ptt rd Pani nece bh CER 14 Graphic 7 Print Preview Single DiVe ooocccoccccooccccocnccocnccocnocanncnannonanos 16 Graphic 8 Print Preview Multi Dive Table occoocccocccocccoocncocnconnnnnnoss 17 Graphic 9 DIVeJPFONIQ esi isso 18 2 9 a erat 0 GaS EIS ICE M m 18 Graphie TT FPTSIePere GS wap bei ud aser en Ad 20 Graphic 12 PIVe TTOllG cs none tru Obi aba ptu aaa 21 Graphic 13 Gas LISUIOF Ballad ads 22 Graphic 14 Ready to laminate dive plan ooocococccocncocncocnnconnconnconnnonnnnns 24 Graphic 15 Complex Dive Profile oooccoocccocccorococncoccccorccorccnanonanonos 252. Altitude Graphic 11 Preferences Now set the dive profile e Setpoint is set to 1 3 e Only this segment is enabled The others can stay there they are just ignored Page 19 of 41 Dive Profile Depth Time Gas 3n DITrimix 15 50 Dn LJ 20fAir Q0 Jl 20 Trimix 15 50 oxygen O0 Graphic 12 Dive Profile Note that MV Plan does not have a starting Set Point like some other software It really makes no difference But if you insist in doing this enter two initial waypoints 0 0 meters 0 0 mins SP 0 7 15 0 meters 0 0 mins SP 1 3 This time we de select the OC Bailout option as we are planning to dive the whole way on Closed circuit It does not matter what gases are Enabled at this point because unless the OC Bailout box is selected they will not be used Press Es Calc to generate the dive plan MV Plan 1 4 Settings GF 15 80 Multilevel false m Time Run Gas SP e rererrrrrrrrrrrrrrr rH tx OS LOCO CO 69 59 CO 99 a ECONO COS Gas estimate based on Dive RMV 20 0 Deco RMV 12 0 1 min Air 0 I Nitrox 50 0 1I Oxy dem Toxicity Olle Ec CINE ll o WARNING This software is experimental and should not be relied upon for actual dives It probably contains errors and may get you bent Points to note e SP is 1 3 all the way indicating that this is a fully closed circuit dive e Laststop is now 6 0 meters
3. 15 Trimix 21 30 1 3 1 12 Trimix 21 30 1 3 1 26 9 Trimix 21 30 1 3 2 28 c 8 Trimix 21 30 1 3 3 31 3 Trimix 21 30 1 3 amp 37 Font size 14 Show Seconds _ Gas First Colour Show Colour Stop Time Graphic 7 Print Preview Single Dive Print options available are e Fontsize select 9 10 12 or 14 to change the size of the dive table e Colour click the colour patch to change the colour of the shading in the table e Show seconds click to show seconds single dive table only e Show colour click to enable the alternating colours e GasFirst click to change the column order for multi dive tables e Stop Time click to show or hide stop times on multi dive tables Page 15 of 41 MV Plan 1 4 GF 30 80 pm R R R R R Gas SP 48 2 2 2 2 221 80 1 3 48 20 23 25 27 30 21 30 1 3 24 833 2130 13 21 23 26 28 31 34 21 30 1 3 18 24 27 29 32 3521 30 1 3 15 25 28 31 34 37 21 30 1 3 Font size Show Seconds Gas First Colour Show Colour Graphic 8 Print Preview Multi Dive Table These tables are designed to be laminated To alter the size of the resulting table change the font size The font size controls the table size The following section goes through specific cases that show you how to use some of the more detailed operations Page 16 of 41 Usage Examples Open Circuit Decompression Dive In this example the plan is t
4. HL16 E decompression model This software is experimental it probably contains bugs and should not be relied upon for actual dives Use it at your own risk WARNING If you follow dive schedules generated by this software you could suffer decompression sickness serious injury or possibly death The author does not warrant that this Enable software accurately reflects Buhlmann s algorithms or that it will produce safe reliable results Diving in general is fraught with risk and decompression diving using mixed gases and rebreathers adds significantly more risk This software is not intended for uneducated users This software and the decompression schedules it produces are tools for experienced mixed gas 1 rebreather decompression divers only If you have not C OC Bailout been properly trained in mixed qgas rebreather Graphic 5 MV Plan Main Screen Leave the OC Bailout checkbox deselected at this point Enter Dive Segments Dive segments are entered into the Dive Profile table The dive profile is defined as the list of Enabled dive segments conducted in the order in which they are listed and then an ascent to the surface To add a dive segment click Enter the details into the blank table row Depth enter depth in meters Time enter time in minutes or enter zero for a Waypoint see Reference Gas select a gas from the drop down list these are the gases entered in the gas table SP enter the s
5. M Value Gradient selection MV Plan sets the M Value Gradient low the first time that it encounters a deco stop From then on every time you move shallower it reduces the gradient This can cause some confusion on dives with a series of complex waypoints when you go up and down and decompress between dive levels This is why the Multi Level Mode option is required In this case MV Plan holds the M Value Gradient at the low setting until the last dive segment is executed and the final ascent begins See Reference information for examples Page 29 of 41 Description Implementation Diluent ppO2 exceeds setpoint If you specify a diluent with a ppO2 in excess of the setpoint MV Plan assumes that you breathe the mix down to the setpoint thus increasing the partial pressure of inert gas In fact the ppO2 will spike first and then decay to the setpoint in an in determinant manner The model s behaviour is conservative from a decompression point of view but does not calculate the increased oxygen toxicity Obviously it is better that you select a more appropriate diluent Diluent is oxygen and depth is greater than setpoint If you specify that the diluent is oxygen and the setpoint is 1 3 but the depth is 6m The model assumes that you are breathing a higher ppO2 than your setpoint and uses 1 6atm as the ppO2 There is no real issue with this from a model perspective Diluent is oxygen
6. decompression with automatic gas selection after the last dive segment specified in the dive profile This should be enabled for open circuit dives where decompression gases are used or for closed circuit bailout scenarios Note that the order of gases in the Gas List is not important Gas selection is based on the MOD Repetitive Dives The repetitive dive panel allows you to enable repetitive dive calculations In this mode MV Plan maintains model data after calculating a dive profile and re uses this after the specified surface interval as the starting point for subsequent dives MV Plan also allows you to Save and Load model data for later use Surface Interval mins lan Graphic 21 Repetitive Dive Fields and Controls Enables or disables repetitive mode Surface Interval specifies the surface interval in minutes Assumed to be breathing air at sea level Hint If you want to perform a surface interval breathing oxygen then conduct a repetitive dive at Depth zero Gas oxygen xX Model is clear Model is loaded Also see the toolbar buttons Save and Load below Toolbar Buttons The functions of the toolbar buttons are Li Calc Calculates the dive plan Page 36 of 41 Table X Clear E Print aT Prefs Load El Save 2 About Exit Page 37 of 41 Calculates a multi dive table with up to 5 runtimes Clears the model and display area Displays a print preview of a ready to laminate dive
7. Graphic 15 Repetitive DING iia 21 Graphic 1 TISSHe AUS rat 21 Graphic 19 Repetitive DW xiii ii 29 Graphic 19 DNVG Pro Maia 34 Graphie 20 Sa st adi puveawin Aa 35 Graphic 21 JSeDelil Vve DIV Cres dia 36 Graphic 22 Preferences ccccccssccesecceeeceseeeueeseeeceeeteueeeceteetneesgeeaeeseeetees 38 Graphic 23 Aude Placa i 39 Graphic 24 About Dialoo ccoocccoccccoccncoccccoonnconnnnnononnnnnnnnnonnnnnonnncnnnnnnnnos 41 Page 4 of 41 Quick Start This section shows you how to get MV Plan up and running quickly More detailed information is given in the Reference section The basic steps are e Installation e Conditions of Use e Preferences Set measurement units and user preferences e Define Gases e Enter Dive Segments e Calculate the dive plan e Print the dive plan Language selection is automatic If MV Plan has a language file for your locale it will be used automatically If you are interested in helping create a file for your language please email me The process involves editing a simple text file with translated text Installation MV Plan is a Java program that can run on any computer with the free Java runtime installed It has been tested on Mac OS X Linux Windows 2000 and Windows XP however it should run on any other computer loaded with Sun Microsystems Java Standard Edition version 1 5 or newer When MV Plan is run it will check that your computer is running the correct ver
8. Now lets work out the bailout plan Assume we have three gases available e Our diluent Trimix 50 15 Page 20 of 41 e Our bailout Air e Our onboard Oxygen Enable the following gases and the OC Bailout option Gas List Air 40 Trimix 21130 BB B LH Owgen 8 Nitrox 60 OC Bailout Graphic 13 Gas List for Bailout Note that have also edited Air and set it s MOD to 40m This tells MV Plan not to switch to Air until the next stop equal to or shallower than 40m Press F Calc to generate the Bailout plan MV Plan 1 4 Settings GF 15 80 Multilevel false m Time Run Gas Si ASS ENDO IE OE AS ASS AS SOT S 0285503 2005023 ES AS OO AS AS 022 15 50 Sr OAS ONO AS Vk Sos On 0 2 AZ GeO O26 15 30 0 0 SS 96 A 7 AS NS E O s ZI 9 NS EO Te OO G29 ZA OO e OSO OLEO Oso Z4 90 A IAS Sl OO ZAS ANO O SANO SS ZO ES 0s 00 Voss ZEE c OVES 49 5 9 NOE lass ral gres cU IESU 21 9 O IA 2M 9 0 cr Clouse IZ OROT Gas estimate based on Dive RMV 20 0 Deco RMV 12 0 l min eo PULS Ds D NECS S SIE Ave d 965 ll Oxygen 395 l Oxygen Toxicity OIU 99 CNO 85 O Page 21 of 41 WARNING This software is experimental and should not be relied upon for actual dives It probably contains errors and may get you bent Points to note e You can see the first two lines show the closed circuit part of the dive as planned e Then the bailout commences with an ascent to the first deco stop on Open Circuit T
9. a surface interval in minutes Adjust the profile and gases for the second dive Calculate the second dive This process can be repeated for third or multi day dives as required Points to note The dive plan window maintains the history of the dives planned in the current session When you save the model data enter a sensible file name like Dive 100 xml and you can also enter a description that is embedded into the file When you load the model data again this description is displayed in the dive plan window to remind you of where the repetitive model data came from The display below shows a previous dive s model loaded and used as the starting point for planning a subsequent dive Model loaded Dive to 50 0 for 20 0 on Coloocli on 24 May 2005 Model updated with Surface Interval of 60 mins REPETITIVE DIVE MV Plan 1 3 Surface Interval 60 mins Settings GF 15 80 Multilevel false m Time Run Gas SE CHO Wilke sl le ZEN S WSO 2S5 30 O25 ZU ES QEON NONE S ND ZU ENIMS A Oe I EE D Alles cS DOT DEED ZA eS NODOS AS Gas estimate based on Dive RMV 20 0 Deco RMV 12 0 1 min Ms 15 50 OL Air 0 1 Oxygen 0 1 Oxygen Toxicity EE OTUs 110 CNS 32 O WARNING This software is experimental and should not be relied upon for actual dives It probably contains errors and may get you bent Any Dive Profile printed will show a Surface Interval Sl on the top line Remember that this profile is specific to
10. and the ability to use a waypoint to switch to open circuit 6m Dive Profile 30 OTrimis 15 50 ol Lj 39 oar E WD CIAT 0 wl Graphic 15 Complex Dive Profile The dive plan generated is shown below Some points to notice Observe the stop indicator to see whether it is an ascent a dive or a deco segment Observe the SP to see whether it is a closed or open circuit segment Observe the Gas changes You will also note that the CNS exceeds 100 for this dive Please see the section on Oxygen Toxicity in the Reference section MV Plan does not calculate air breaks this is up to you Page 23 of 41 MV Plan 1 3 Settings GF 15 80 Multilevel false m Time Run Gas SE we 07s SS AS SO ils US SIMS OA OS AA QU XP TN DE o OS CSO OS SS WU sig Oe 23 OS T0 E SO Oso ILS Sls Ss SS MEE ONIS 070 03 sy 50 als CSO OOO IS sc 130 Oe eye iW lies ex OI I OZ OO OO ZAR SS c 4 cO 9 ZA E S 2t Ossie 4d ES ES 0 5200 Q4 ZS AS Ossie 0S Zl lhe E he e 89 Ors Zee AOS TO 00 ASS A Gee 200 0100 900 900 9016 6 OOTOLO O Sa 200 40S TOOTE Gas estimate based on Dive RMV 20 0 Deco RMV 12 0 l min Medina 5750 DE Alr 50 3 Oxygen 6033 1 Oxygen Toxicity OIU 15S eNS oo WARNING This software is experimental and should not be relied upon for actual dives It probably contains errors and may get you bent Note 1 Under certain circumstances you may need to set Multi Level mode in the preferences Plea
11. laws of New South Wales Australia This software is provided free of charge for experienced mixed qas rebreather divers to evaluate m value gradient profiles based on Erik Baker s m value gradient calculations and the Buhlmann AHLl56 B decompression model This software is experimental it probably contains bugs and should not be relied upon for actual dives Use it at your own risk WARNING If you follow dive schedules generated by this software you could suffer decompression sickness serious injury or possibly death The author does not warrant that this software accurately reflects Buhlmann s algorithms or that it will produce Affirm your acceptance or exit E Graphic 2 Conditions of Use Scroll down and read the CONDITIONS OF USE and affirm your agreement by clicking the Agree button If you do not understand these CONDITIONS OF USE or do not agree with them you may click exit These CONDITIONS OF USE are reproduced on page 2 of this User Guide Page 8 of 41 Setup This section will guide you through a simple setup and first use Preferences Clicking the button on the main toolbar opens the Preferences Dialog shown below Preferences Gradient Factors Metric C3 Imperial Deco Options Time is Runtime Extended Output _ Multilevel Mode Cancel Graphic 3 Preferences Dialog Here you can set basic operating parameters for MV Plan Details of these setti
12. must not use this software LICENSE This software is copywrite c 2006 Guy Wittig This program is free software you can redistribute it and or modify it under the terms of the GNU General Public License as published by the Free Software Foundation either version 2 of the License or at your option any later version This program is distributed in the hope that it will be useful but WITHOUT ANY WARRANT Y without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE See the GNU General Public License for more details Java is a trademark of Sun Microsystems This document was created in Open Office www openoffice org and is copywrite Guy Wittig 2006 Page 2 of 41 Table of Contents COMMONS OF USO REI T 2 QUICK eI Utm 5 IST so CETERI 9 Mac Mmstalatlon reanna T VIO OW i e ES T A me Tem T YOOL eee asians o ae an ere 8 What IS AV A traia 8 CONGINONS OP WSC carnada 8 Scl PM RN TD 10 P EeIBrehee S noted dS tit nia ao cn 10 DEIS Gaser 11 Enter DIVE SEM AMS des 12 Calculate WING Plain deci 13 Calculate DIVe Serles usi compe bone e 14 PUNTA ave LAID TRU T t o ETT 16 Usage EX AMPpPICS siii A ae Sasa cence uia ein Mod A 18 Open Circuit Decompression DiVe oocccocccocccccnccooccconcnocnnnanocanocanncnrnnnonnnos 18 Closed Circuit Decompression DivVe oocconcccocccocncccnccocnconnconnccanocanoconnnnnos 20 Complex WAYPOINTS sessi tih do lic S DERE 25 REPEUIVS DIV
13. parameters are contained in the mvplan xml configuration file This xml file can be edited carefully with a text editor On Windows and Linux the file is in the same folder as the application On OSX the mvplan xml file is contained inside the application bundle Ctrl Click the MV Plan icon and Show Package Contents Navigate to Contents Resources Java to find the configuration file It can be edited with TextEdit lf you damage the file delete it and it will be rebuilt next time MV Plan opens You will need to re enter you preferences and standard gases etc Page 32 of 41 Choosing Gradient factors Selection of appropriate gradient factors is an important consideration in using MV Plan As am not a diving instructor cannot give specific recommendations as to what numbers to use but can offer some general advice e The lower the number the more conservative to the point where a GF of 0 0 means that MV Plan will not allow any compartment to exceed ambient pressure probably not practical e More conservative gradient factors should be used on deep trimix dives e g 15 80 e Numbers in common use for moderate exposure decompression dives seem to be of the order of 30 85 e If you are using an Evolution rebreather you could review section 11 2 of the manual that gives specific recommendations on gradient factors for different types of dives It can be downloaded here http www apdiving com evomanual Evolution Instr
14. plan and allows access to print settings Opens the Preferences dialog see below Loads a previously saved model data file e g Dive100 xml Only enabled in Repetitive mode You can only load models that have been stored in the same measurement Units that MV Plan is set to Saves the current model data to a file for later use Displays the program version registration information and Check for Updates controls see below Exits the program and saves your preferences Preferences The preferences dialogue allows a number of program parameters to be altered Low We Metric High 5 Imperial Deco Stops Dive Settings Deco Options Depth Ascent Time ts Runtime _ Extended Output _ Multilevel Mode Last Descent Altitude Cancel Graphic 22 Preferences Field Descriptions Gradient Factors Low low gradient factor used for initial stop High high gradient factor used for final stop Gradient factors can be set from O meaning ambient pressure through to 95 See Choosing Gradient Factors above for more details Deco Stops Depth the depth increment for deco stops in meters 1 to 10m or 3 to 33ft permitted Last the last stop depth in meters 1 to 10m or 3 to 33ft permitted Time the time increment for deco stops in minutes All deco stops will be a multiple of this time 0 1 to 5 permitted Gas Usage Dive Gas usage for the dive in litres per minute on the surface 5 t
15. practice and includes the descent time in the bottom time Note that print options are now in the Print Preview window Page 39 of 41 Extended Output Produces a more verbose output which shows the END M Values controlling compartment and gradient factor for each stop My Plan died Settings GF 15 80 Multilevel false ppH20 0 627 msw DESCR 4em tor 02 23 I 21 on rem 21 30 SPs 1 3 END 25m Dives 48m ror 17 36 I 20 on Trimix 21 30 SPs S END 25m ASC 24m bor 02 23 22 on Trimix 21 30 see 1 3 END 6m DECO 24m for 00 35 I 23 on Trimix 21 30 SP S END om Me values 59 02 GF 23 DECORE IMEE Or s 24 on Vrimax 21 80 Se los END 4m M Value 622 0217 Gr 0 DECO lem for 01 00 25 on Trimix 21 30 SBP 1 3 END 2m Me Values 66 03 GF 39 DECO Sir tor OEO O O 1 SU se 123 END Om MS Values O MSIE SS DECO 12m for 01 00 I 27 on Trimix 21 30 SP 1 35 END Om Me Values 74 04 GF 560 DOE 9m tor 02 00 I 29 on Trimix 21 30 SP 1 8 END Um M Value 793 02 GE 642 DECO 6m tom 10 00 39 on Trimix 21 30 SP 1 3 END Om M Value 83 04 GE s 80 Gas estimate based on Dive RMV 17 0 deco RMV 12 0L min Air s 0 0 Oxygen 0 0L Oxygen Toxicity OTUS 57 CNS 21 WARNING This software is experimental and should not be relied upon for actual dives It probably contains errors and may get you bent Multi Level Mode Normally MV Plan initialises the gradient factor to Low at the fir
16. r5 NOD Zl O20 Ors A AS eee ZZ POOTO ES A gt Sg O20 IIS 01 00 04 Sig 1G 0 A IAS 39 071 AOS OL IO BO PORTOT OOO DIAS SEO S rS Ws sie Use DOOU Gas estimate based on Dive RMV 20 0 Deco RMV 12 0 l min Air S Niro m9 E 220 1 Oxygen MOS O US Ae IS E TES WARNING This software is experimental and should not be relied upon for actual dives It probably contains errors and may get you bent Points to note This dive used gradient factors of 30 85 SP is zero indicating that this is an open circuit dive The initial ascent indicated by is to 21m on Air Gas switches to 50 at 21m being the first stop depth at or above the Maximum Operating Depth MOD specified for Nitrox 50 Total runtime is 33mins Gas estimates are shown for the Respiratory Minute Volume RMV numbers specified in Preferences Oxygen Toxicity estimates are shown Page 18 of 41 Closed Circuit Decompression Dive In this example the objective is to conduct a closed circuit dive to 78m for 20mins on Trimix 15 50 As this dive is deeper lets change some Preferences e Gradient factors changed to 15 80 e Last stop depth changed to 6 0m Low High rDeco Stops Dive Metric C3 Imperial Dive Settings 7 Deco Options Time is Runtime _ Extended Output _ Multilevel Mode Ascent Descent
17. MV Plan User Guide Version 1 5 1 26 August 2009 Page 1 of 41 Conditions of Use Use of this software is governed by the laws of New South Wales Australia This software is provided free of charge for experienced mixed gas rebreather divers to evaluate m value gradient profiles based on Erik Baker s m value gradient calculations and the Buhlmann ZHL16 B decompression model This software is experimental it probably contains bugs and should not be relied upon for actual dives Use it at your own risk WARNING If you follow dive schedules generated by this software you could suffer decompression sickness serious injury or possibly death The author does not warrant that this software accurately reflects Buhlmann s algorithms or that it will produce safe reliable results Diving in general is fraught with risk and decompression diving using mixed gases and rebreathers diving adds significantly more risk This software is not intended for uneducated users This software and the decompression schedules it produces are tools for experienced mixed gas rebreather decompression divers only If you have not been properly trained in mixed gas rebreather decompression diving by an internationally recognized technical certification agency and or don t have a firm handle on decompression planning and mixed gas diving DO NOT USE THIS SOFTWARE OR THE DIVE SCHEDULES CREATED BY IT If you do not understand or do not agree to this statement you
18. The first column is a visual indicator where V descend ascend level dive decompress SP setpoint or 0 0 for open circuit Gas usage is displayed in litres for enabled gases Note in open circuit mode SP 0 0 you need to enable the bottom gas to get the volume to display Oxygen toxicity estimates are displayed Remember these are estimates see Reference Page 12 of 41 An extended output option is also available which shows details of the controlling compartment M Values etc See Reference Estimates for open circuit gas usage and oxygen exposure are also shown See Reference for a discussion on Oxygen Toxicity calculation methodology This text output can be cut and pasted into other documents Calculate Dive Series Clicking Table allows you to create a series of up to 5 dive plans in a table format Table Generator Select segment to modify 4am 2U0 00min Air 1 5 al Enter time modifiers e g 5 5 5 5 Jho hs fzo Graphic 6 Specify Dive Table MV Plan identifies the last dive segment specified excluding way points for modification of the Time Any non zero dive segment can be used as the basis for the dive table Other dive segments are available via the selectors Graphic 6 shows the 48m 20min segment selected The first dive calculated will be the nominal time then up to another 4 dives will be calculated by applying the time modifiers to the specified Time In this
19. and depth is less than setpoint If you specify that the diluent is oxygen the setpoint is 1 6 and the final deco stop is 3m The model assumes that you are breathing oxygen at the depth specified and uses a ppO2 of 1 3atm There is no real issue with this from a model perspective Page 30 of 41 Description Implementation Altitude Calculations If you specify an altitude in the Preferences Dialog MV Plan will adjust the absolute pressures used in the decompression calculations This has the effect of reducing the absolute pressure at depth and reducing the air pressure on surfacing MV Plan assumes that you are using a calibrated depth gauge that indicates the correct depth at altitude An analogue depth gauge does not provide this compensation For example at 3000m the atmospheric pressure is 0 69bar So at 3m underwater an analogue gauge will read zero depth When using closed circuit at altitude MV Plan will maintain the correct absolute setpoint So at an altitude of 3000m when at a deco stop of 6m the absolute pressure is 6msw 0 69bar 1 29bar absolute A rebreather set 1 3bar will not be able to reach setpoint MV Plan will assume that at any deco depth where the absolute pressure is below setpoint you are breathing pure oxygen at the absolute pressure less water vapour pressure Oxygen Toxicity Calculations MV Plan calculates CNS using a table method just like you do
20. ave this zero to indicate open circuit Enable Indicates that this segment is to be used in the dive Page 34 of 41 The Controls are Moves the segment up in the list thus defining its order Moves the segment down in the list Adds a new segment Deletes the currently selected segment Gas List The Gas List defines the gases that you want to use Before a gas can be used in the Dive Profile it must be defined here Furthermore this list specifies which gases are enabled for use in open circuit mode Gas List ae II IC Trimix 21 30 E ae Trimix 660 897 lw Owen 8 Wo MirxS0 a o _ OC Bailout Graphic 20 Gas List The field descriptions are Name Automatically determined from the gas composition MOD The depth at which the gas will be automatically selected during ascents This is entered in the gas popup or is automatically calculated for a ppO2 of 1 6 Note that there is nothing to stop you specifying a gas to be used in excess of it s MOD in the Dive Profile this up to you to get right Enable Tick this to allow automatic selection of this gas during ascent Disabled gases may be left in the list for later use The Controls are Brings up the gas popup for entry of a new gas Brings up the gas popup for editing of the currently selected gas Page 35 of 41 Deletes the currently selected gas OCiBailout Instructs MV Plan to perform open circuit ascent and
21. case dive schedules will be created for 20min 22min 25min 27min and 30min Entering a zero time modifier will cut the table off at that point onwards E G To specify only 3 dive times enter zero in the 4 box Page 13 of 41 MV Plan 1 4 Settings GF 10 85 Multilevel false m R R R R R SE Gas 48 2 2 2 2 SS ZA 30 48 20 22 29 27 SOS SO SU SE E AG as TAS 29 gt i A SO 24 24 26 30 DE Dp ie Bo 55 21 25 2 3l DS Soc e ike 26 AS 3 34 yee ee MEE qa IRS 2 29 33 35 EMEN AO 1 2 28 30 zdl oy AS yc 0 9 29 97 oF 40 IS E 20 6 OZ 36 42 45 Bly E AIO 3 oe 42 49 53 SO Oxygen Toxicity Mass WARNING This software is experimental and should not be relied upon for actual dives It probably contains errors and may get you bent This text output can be cut and paste into other documents It shows the Run times and optionally Stop times if selected in the Print Preview dialog The CNS shown is the maximum encountered on any dive plan If this exceeds safe limits you should investigate further by calculating each individual dive plan Page 14 of 41 Print a dive table When you are satisfied with the dive plan you can print a ready to laminate version Press the button to display the Dive Profile MV Plan 1 4 GF 30 80 m Gas SP S Ru 48 Trimix 21 30 1 3 2 2 48 Trimix 21 30 1 3118 la 21 Trimix 21 30 1 3 3 2 3 21 Trimix 21 30 1 3 0 18 Trimix 21 30 1 3 1 2 F3 R3 ph pho pp on E o Oo e r3
22. defined by Buhlmann your next stop a little more until at your final stop you get to 80 of the M value This effectively adds conservatism in a way that is based on some objective methodology For further reading look for a copy of Erik Baker s paper Understanding M Values on his web site http www decompression org baker home htm MV Plan aims to implement Buhlmann and Baker s methodologies but it should be recognised that there is a fair bit of interpretation required on the details of implementation That is why there will often be a small difference in the stop times calculated by different deco programs This table lists some of the implementation details that have used Page 28 of 41 Description Implementation Respiratory co efficient Rq Partial pressure of water vapour in Alveolar gas effectively reduces the partial pressure of inspired gas This has a significant impact on deco times especially with rebreathers MV Plan uses an Rq of 1 0 being Buhlmann s number and representing a partial pressure of water vapour of 0 627 msw The ppH20 can be changed in the mvplan xml configuration file by changing this section void property PH20 gt lt double gt 0 627 lt double gt SOMO Valid range is 0 0 to 0 7 See notes at the bottom of this table for instructions on editing the configuration file Deco Steps For simplicity MV Plan assumes instantaneous ascent between deco stops
23. etpoint in atm for closed circuit or enter zero for open circuit Enable select enable to activate this dive segment Segments that are not enabled are ignored in the current dive profile You may use the Up and Down arrows to re order the dive segments or click to delete a segment remember you can just deselect Enable to ignore a dive segment Page 11 of 41 Calculate Dive Plan Clicking 3 Calc calculates the dive plan and sends it to the output window MV Plan 1 4 Settings GF 10 85 Multilevel false m Time Run Gas Se VASOS TEE SNO IE S EULISMOD eS A 10 7 1 091 20819 A OE sce T ges s ps Z3 S Ee S c0 2 2L OPE S TO OT ILLIC PIU SO SS A RU OO 17 S SP dU SOS Iter oe Gls OL I0 ly XUI S AA Te 2 e M Noe AA 160 028 Zi SOS 2 COD OO LA AS lt COG 10 5 10 0 01 gt Zi 8301 les SOS OG eC hes Za OS Gas estimate based on Dive RMV 20 0 Deco RMV 12 0L min Trimis 8 75 OL Air OL NIELO 0 OL Oxygen OL OXy den omes OTUs ONIS dL O WARNING This software is experimental and should not be relied upon for actual dives It probably contains errors and may get you bent This output shows a simple tabular dive plan The columns are mostly self explanatory but a couple of points to note The header shows the Gradient factor settings which obviously make a big difference to the dive plan Multi Level mode status which is explained in Reference can also make a difference for complex dive plans
24. manually So for a exposure of 1 51 to 1 60 ppO2 your CNS clock ticks at a rate of 60 45 per minute If you have an exposure of greater than 1 6 atm MV Plan quickly adds to your CNS so as to show you that you have a problem but any exposure of gt 1 6 atm is not well defined and should be considered inaccurate That is why a specific warning is displayed Page 31 of 41 Description Implementation Conservatism Factors Some decompression software utilises conservatism factors in addition to m values which effectively increase the rate of gas absorption and decrease the rate of gas elimination This increases decompression time and thus may make the profile more conservative To allow MV Plan to produce similar profiles it has two configuration parameters in the mvplan xml configuration file that apply these factors They are not currently available in the GUI void property factorComp gt lt double gt 1 0 lt double gt lt lt VO lt void property factorDecomp gt lt double gt 1 0 lt double gt E ADAL gt The compression factor can be set from 1 0 nominal to 1 3 30 acceleration of gas absorption The decompression factor can be set from 1 0 nominal to 0 7 80 slow down in off gassing Values outside this range will be reset to 1 0 When these factors are active they will be shown on the text dive profile mvplan xml Configuration File A number of configuration
25. ngs can be found in the Reference section Page 9 of 41 Define Gases Gases must be entered into the Gas List table If required resize the main window and move the center divider so that it is positioned for your screen size Click to bring up the Gas Screen ON Edit Gas He 0 02 21 MOD 66 ppO2 I l I og Og LN REI er el sl 0 8 10 1 2 1 4 1 65 Cancel j Graphic 4 Gas Screen Here you enter the Helium fraction and the Oxygen fraction The remainder is assumed to be Nitrogen Pressing TAB enters the MOD Maximum Operating Depth field By default this is automatically calculated as the depth in meters where the gas would deliver a ppO2 of 1 6atm Moving the ppO2 slider adjusts the MOD to the depth where the gas would result in that ppO2 MV Plan uses MOD to initiate a gas switch on open circuit ascent You can change this MOD to the depth at which you want MV Plan to initiate a gas switch The ppO2 slider will respond and indicate the resultant ppO2 at that depth Click to save Page 10 of 41 MV Plan 1 4 F Calc Table Clear Print BZ Prefs LJ Surface Interval mins xX CONDITIONS OF USE Use of this software is governed by the laws of New South Wales Australia This software is provided free of charge for experienced mixed gas rebreather divers to evaluate m value gradient profiles based on Erik Baker s m value gradient calculations and the Buhlmann
26. o 50l min or 0 17 to 1 77cuft min permitted Deco Gas usage during deco in litres per minute on the surface 5 to 50 or 0 17 to 1 77cuft min permitted Page 38 of 41 Dive Settings Ascent Ascent rate Fixed at 10m min 33ft min for Buhlmann Descent Descent rate in meters min 5 to 50m min or 16 to 165ft min YE permitted Cd There is no option for variable ascent and descent rates for different depths Altitude Enter the altitude Assumes that you are acclimatised to the altitude 0 to 3000m or O to 9900ft permitted Dive plans printed with an altitude setting show the altitude on the heading MV Plan 1 3 GF 15 80 1000m Altitude shown 24 Trimix 21 30 Galas 21 Trimix 21 30 1 3 rer 23 Altitude Plan MV Plan assumes that your depth gauge is able to produce accurate depth readings at altitude A dive computer like a VR3 compensates for altitude to give correct readings Cheaper or analogue depth gauges to not do this and give erroneous readings This could cause you to dive and decompress deeper than planned and thus do insufficient decompression A pop up reminds you of this when ever you change the altitude from zero Units Metric Uses meters and litres throughout Imperial Uses feet and cu ft throughout Deco Options Time is runtime Tells MV Plan to consider the time specified for the FIRST dive segment not waypoint to be runtime and not just segment time This is common
27. o conduct a dive to 40m on Air and decompress on 50 Nitrox Enter a dive segment as shown Drve Profile Only Enabled segments are processed ar Time Gas SF Enable O Trimix 15 50 o LJ 208r o 0 e A uU 8 DOwgen o Graphic 9 Dive Profile Points to note e Setpoint SP is set to O indicating open circuit e Only this segment is Enabled Enable the Air and Nitrox 50 Gases for open circuit use and select OC Bailout to indicate that you want MV Plan to automatically change gases on ascent Gas List CERRAR RN Trimix 21730 a Ll Trimix 1550 9n oo Nitrox 50 Tick for automatic deco gas selection Oc Bailout Graphic 10 Gas List OC Bailout is used to tell MV Plan to automatically select gases from the Gas List on ascent This is appropriate for open circuit dives where you will use Page 17 of 41 decompression gases or for open circuit bailouts from a closed circuit dive OC Bailout should be left deselected for dives where you wish to continue to the surface using the same gas as you were using on the bottom Note that only Enabled gases are automatically selected and they are used at the next stop depth above the specified MOD Press amp Calc for the open circuit dive plan with automatic selection of Air and Nitrox 50 MV Plan 1 4 Settings GF 30 85 Multilevel false m Time Run Gas SP OAOT OO NO Ze 10 0 O40 ES 1040 0120 20 00 DE EE
28. puter e Create a folder like c Program Files Mvplan e Unzip Mvplan exe into the folder e Optionally create a shortcut for your desktop e Double click it to run Note the exe version of Mvplan is simply a java jar file wrapped in a Windows launcher This launcher will attempt to find Java prior to running Mvplan If Java is not properly installed on your computer it will prompt you to visit the sun com web site and download it Linux etc After checking your Java version download Mvplan jar to your computer and put it in a convenient location like a program folder from where you can run it e Download Mvplan jar to your computer Page 6 of 41 e Create a folder like home username myapps Mvplan e MoveMvplan jar into the folder e Optionally create a shortcut for your desktop e Double click it to run Note If your Linux computer is not set up to run Java jar files you will have to set a file association or run from the command line The command will be something like this usr java jdki 5 0 06 jre bin java jar Mvplan jar Upgrading When upgrading to the new version of MV Plan simply replace the old Mvplan jar orMvplan exe file with the new one All your settings are contained inside the mvplan xml configuration file which typically lives in the same directory as Mvplan On a Mac the mvplan xml file is embedded in the application bundle To preserve your preferences and Dive Gas settings you need to extrac
29. rimix e When the MOD for air is reached the plan switches to air e The final stop is on Oxygen e Gas estimates are given as this dive includes open circuit components Note Gas consumption can be very high on bailouts Conservative RMV values should be selected MV Plan 1 2 GF 15 80 m Gas sP s run P 74 Trimix 15 50 1 3 16 20 45 Trimix 15 50 1 3 1 24 39 Trimix 15 50 1 3 1 26 MV Plan 1 2 GF 15 80 m Gas SP S Run 74 Trimix 15 50 1 3116 20 33 Trimix 15 50 1 3 1 28 27 Trimix 15 50 1 3 1 30 21 Trimix 15 50 1 3 3 35 15 Trimix 15 50 1 3 5 42 9 Trimix 15 50 1 3 7 54 Graphic 14 Ready to laminate dive plan Now we can print and laminate our dive plans back to back Page 22 of 41 Complex waypoints MV Plan allows you to string together a number of dive segments and way points to define a complex dive profile A waypoint is simply a dive segment with zero time and it allows you to change gases setpoints or to switch between open and closed circuit For this example will show a complex dive that illustrates a number of these points Dive to 78m for 20mins on Trimix Ascend to 50m and continue at that depth for another 10 minutes Switch to air diluent at 30m Go to open circuit oxygen at 6m This illustrates the ability to string together multiple dive segments 78m and 50m the ability to use a waypoint for a diluent change 30m
30. se see the Reference section for an explanation of this 2 A bailout plan for a complex dive like this cannot simply be obtained by selecting OC Bailout MV Plan will bailout after the last segment 6m which is not much use You need to go back and explicitly plan how you want to bailout Page 24 of 41 Repetitive Dive MV Plan allows you to retain model data after a dive to save it to a file and to use it for planning repetitive dives The repetitive dive panel enables this function when the checkbox is ticked Tick for Surface Interval mins Bo repetitive dives Graphic 16 Repetitive Dive The tissue indicator shows the model status upon surfacing xX Model is clear Model is loaded Click on the tissue indicator to bring up a larger version in a new window Tissue Status Helium Nitrogen Graphic 17 Tissue Status The tissue status window can be stretched to a larger size and actual compartment numbers and pressures will be shown Orange bars represent the partial pressure of nitrogen and the red bars helium The green line represents ambient pressure To plan a repetitive dive do the following e Select repetitive dive mode by selecting the checkbox e Ensure the model is clear or press the Clear button on the toolbar e Plan the first dive The model status shows that the model is loaded e Optionally save the model data to a file for later use Page 25 of 41 Enter
31. sion of Java If your version of Java is too old shown and you will be requested to upgrade Error You have Java version 1 4 This application requires Java Runtime version 1 5 or later Please download the Java Standard Edition Runtime from http Exit Graphic 1 Java Version Page 5 of 41 Sun has a web page that will run an Applet in your browser to check that Java is installed and running http jJava com en download help testvm xml If the little guy dances across the screen and the version is 1 5 or greater then you are set up ok If not then download Java here http www java com en download manual jsp Whilst Java is a fairly large download you only need to do it once Mac Installation Java is already loaded on Mac OS X computers 10 3 and above but the version 1 5 update must be either loaded via the automatic update system or can be loaded from Apple here http www apple com macosx features java To install MV Plan you simply need to download the mvplan dmg disk image file from the web site and do the usual Apple thing e Mount the disk volume e Drag MV Plan to you applications folder e Runit As Java is processor independent MV Plan will run natively on either PowerPC or Intel Macs Windows After checking your Java version download the Mvplan zip file and extract the Mvplan exe file Put this is a convenient location and double click it to run it e Download Mvplan zip to your com
32. st deco stop encountered From then on it linearly increases the gradient factor until the final stop when it is set to High On dives with multiple depth segments it is possible that decompression encountered during the excursion from a deep to shallower segment will initialise the gradient factors prematurely Selecting this option keeps the gradient factor set at low until the last dive segment is executed Use the Extended Output display to see the effect on such dives Page 40 of 41 About Dialog The About Dialog shows program version and registration details and controls program update checks Mv Plan 1 4 13 Jul 06 2005 Guy wittig Experimental m value gradient decompression software Based on Erik Baker s m value gradient calculations Must not be relied upon For actual dives Use subject to CONDITIONS OF USE Check For updates every davs Graphic 24 About Dialog Check for Updates controls whether MV Plan checks for updates If an update is available MV Plan will display a notification window Update progress is shown on the main window If MV Plan determines that you have the current version a check mark is displayed in the update progress indicator Clicking on the MV Plan icon opens your browser at my web site Follow the Diving links to the MV Plan page Page 41 of 41
33. t this file from the old application bundle and place it inside the new one in the same location Ctrl Click the application icon select Show Package Contents navigate to Contents Resources Java and there you will find the file Copy this file out of the old application bundle and paste it into the new one into the same location If this is too hard then you will need to re enter your preferences Sorry What is Java Most computer programs have to be written for specific processors and operating systems This means that there are different versions required for each type of computer That means a lot of work for developers and is why most programs are for PC or for Mac but rarely for both Java changes all this by providing a common software environment for programs to run in independent on the underlying computer In fact there are versions of Java for devices as small as smart cards or mobile phones through to mainframe computers You simply install a copy of the free Java Runtime JRE on your computer and it is then capable of running a Java program In fact most computers already have Java installed but if not you can download it from Sun Microsystems the inventors of Java Conditions of Use Prior to using MV Plan you must read and agree to the Page of 41 CONDITIONS OF USE Conditions of Use Scroll down to read these Conditions of Use completely CONDITIONS OF USE Use of this software 13 governed by the
34. the repetitive dive sequence and should not be kept as a standard dive plan Page 26 of 41 MV Plan 1 2 GF 15 80 51 60 SI 60 shows this is a repetitive dive gt 30 Ai 1324 25 12 Air 00 4 31 Graphic 18 Repetitive Dive Note that keeping track of multiple dives over multiple days is possible but certainly requires some discipline in keeping accurate records It is up to you to do this correctly Page 27 of 41 Reference This section discusses some of the technical aspects of the operation of MV Plan and then goes through each option in detail Decompression Discussion MV Plan is based on the Buhlmann ZHL 16B algorithm with Erik Baker s M Value gradient method for conservatism The M Value is the maximum compartment overpressure permitted by Buhlmann before significant bubble formation is likely to occur Strict adherence to his model and these M values is likely to get the average fit diver bent about 5 of the time As such most deco programs have some level of conservatism built in and Buhlmann himself recommends this Erik Baker proposed a method of scaling back these M Values as you ascend from your dive This M Value gradient method defines a starting and ending gradient factor which is progressively applied as you ascend from a dive So for gradient factor settings of 30 80 your first stop is determined to be the depth at which you would penetrate only 30 into the overpressure limit
35. to traditional decompression procedures Under no circumstances should you rely on the decompression schedules generated by MV Plan especially if it produces decompression schedules more aggressive than traditional procedures Page 33 of 41 The fact is that if you regularly do decompression diving you will get bent to some degree someday In fact although have never been bent 90 of my diving buddies have been bent to some degree MV Plan does not provide extra options for conservatism other types of deep stops etc as this is just putting approximations on top of approximations In other words Putting Lipstick on a Pig No matter how you pretty it up it is still a pig So where you see the pig you know what mean Operation This section describes each option in detail Dive Profile The dive profile area on the main screen lets you enter multiple dive segments Segments are recognised and processed in order when they are enabled but commonly used segments may be left there Disabled for later use Drve Profile 30 O Trimix 15 50 78 580 0Trimii5i0 13 30 Ohr o 13 0 B Djwgen 0 Graphic 19 Dive Profile The field descriptions are Depth The segment depth in meters Depth is limited to 100m Time The segment time in minutes Time is limited to 100min Gas The segment gas as defined in the Gas List SP The segment Set Point in atmospheres of oxygen SP is limited to 1 6 Le
36. uction Manual 0505 pdf e MV Plan will allow a GF of up to 95 being more or less nominal Buhlmann but this is not recommended e suggest you also read Erik Baker s paper Confusion About Deep Stops on his web site http www decompression org baker home htm e Above all ask your diving instructor for recommendations on suitable numbers for your needs A Reality Check Decompression theory is an approximation and should not be confused with the real world It is entirely probable that you could dive with all the conservatism in these models and still suffer decompression sickness There are many variables and even day to day variations in your personal physiological response to the dive It is not my place to tell experienced divers how to dive but never the less MV Plan has some bullt in limits to depth time and setpoints Even so it will allow you to enter dive profiles that are in the extreme range It must be recognised that the Buhlmann model is not well validated for extreme dives especially extreme trimix closed circuit dives and you are certainly risking decompression sickness or death when conducting this type of dive Further more there has been no long term study on the effect of gradient factor conservatism and although it is more conservative than straight Buhlmann this cannot be proven As such as stated in the CONDITIONS OF USE this software should be considered experimental and used only to compare gradient factors
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