Posts Tagged ‘Deco’

Diving Log 5.0.13 released

Tuesday, April 29th, 2014

Today you can download the next update of Diving Log, which brings some great new features:

If you have version 5.0.12 installed, you can simply install the update setup. If you have an older version, I recommend to install the full setup instead (you do not need to uninstall the old version before).

Diving Log requires now the .NET Framework 3.5, which is already included in Windows 7. For Windows 8 it will be installed automatically. For Windows XP and Vista you have to install it manually.

New beta version now available

Monday, March 31st, 2014

You can download a new beta version today:

The beta contains the following new features:

If you find any problems or bugs, please let me know. Diving Log requires now the .NET Framework 3.5, which is already included in Windows 7. For Windows 8 it will be installed automatically. For Windows XP you have to install it manually.

Deco calculations integrated in Diving Log

Monday, March 31st, 2014

This is something I wanted to implement for a long time and now I’m happy to announce that Diving Log has finally integrated deco calculations. I’ve implemented the Bühlmann ZH-L16 algorithm and now Diving Log can display data like NDL, ceiling, stop time and tissue saturation even if this data cannot be imported from the dive computer. Most sport dive computers do not record the relevant deco information and because of that, this data is missing in Diving Log and you have to go into the manufacturer software if you want to see it.

If you want to try it, please download the latest beta version first. In the logbook window, open the “Profile” tab and click the “Deco Calc” button to view the current dive in the new deco calculator window:

Open the deco calculator

Open the deco calculator

Deco Calculator

Deco Calculator with ppN2 tissue data

On the top, you have the depth profile with deco ceiling and gas switches. In the toolbar you have several display options and you can switch between the three ZH-L16 variants (A, B or C). You can also switch between data calculated by Diving Log and the data recorded and downloaded from your dive computer (if available). That way you can compare the results easily.

ppHe tissue saturation

ppHe tissue saturation

On the right side, you have a virtual dive computer display. Click anywhere into the profile on the left to update the computer display. On the “Gas” tab, you can quickly change the O2 and He values of the current gas for simulation. This will not change the gas stored in your logbook, so you can safely play around with the simulator to see how different gas mixtures influence the tissue saturation and deco profile.

ppO2 profile with gas configuration

ppO2 profile with gas configuration

On the “GF” tab, you can activate gradient factors (GF High and GF Low) to adjust the conservatism. When deactivated (GF 100/100), you have a pure Bühlmann calculation. When activated (default GF 30/75), you get a more conservative deco profile with a lower first stop and longer last stop. The gradient factor is not downloaded from the dive computer, so you may have to adjust it manually to your preference.

NDL / Stop Time with GF configuration

NDL / Stop Time with GF configuration

Additionally to tissue saturation, ceiling and stop time, Diving Log calculates the oxygen toxicity profiles CNS and OTU.

OTU and CNS profiles

OTU and CNS profiles

When you move the red cursor line around, Diving Log will not only update the dive computer display, it also updates the current tissue saturation [%]. Blue bars mean on-gassing, green bars mean off-gassing. If you see a red bar, this tissue is over-saturated (> 100%).

Tissue saturation (M-Values)

Tissue saturation (M-Values)

The deco calculator supports OC (open circuit) and CCR (closed circuit rebreather) dives with air, nitrox and trimix. Here you can see a CCR dive and bailout with air:

CCR dive with bailout

CCR dive with bailout

Current limitations and facts you need to know:

  • No repetitive dives! Every dive is calculated isolated and previous dives and tissue saturation are not taken into account!
  • No altitude diving! Every dive is calculated at sea level
  • The calculated data will differ from the data displayed on your dive computer during the dive! This is because of different algorithms, parameters, other influences and limitations
  • The current deco calculator is BETA. If you find any problems or errors, please let me know!
  • The changes you make to the gas mixtures are just for simulation. No changes will be made to your stored logbook data
  • Supported dive types: OC (open circuit) and CCR (closed circuit rebreather) with air, nitrox or trimix
  • Supported deco algorithms: Bühlmann ZH-L16A, ZH-L16B and ZH-L16C (default)
  • Gradient factors can be used for conservatism adjustments
  • Bühlmann 1b values are being used

This data will be calculated:

  • Tissue saturation (ppN2, ppHe, M-Values)
  • NDL (no deco limit)
  • Ceiling (deepest deco stop)
  • Stop time of deepest deco stop
  • CNS (central nervous system oxygen toxicity)
  • OTU (oxygen toxicity unit)

Disclaimer (full version included in application):

  • Do not use this calculator to plan real upcoming dives
  • Always compare the results with other applications and dive computers
  • You use this application at your own risk
  • Use a dive computer when you go diving