Whenever a new dive is created, it uses default dive settings, and these include depth unit, RMV, ascent and descent rates, safety factor as well as advanced VPM-B parameters. To change these defaults use the "Dive/Default dive settings" menu option.
Once the dive has been created, its settings can be customised in 2 different ways: by changing the defaults (as described above) or by providing a set of custom settings for a particular dive. This may be necessary, for example if planning a dive in difficult conditions (current, heavy gear, etc.) that could potentially affect gas consumption, etc.
The settings for an individual dive can be customised using the "spanner" toolbar button or by means of selecting the "Use custom settings" option (in the dive properties dialog). Once the option has been selected, the "Settings..." button is activated and allows them to be customised. Dives with non default settings have a small exclamation mark displayed in the dive tab.

Surface interval is calculated automatically based on the start date and time of the dive. To change it, use "Dive/Properties…" menu option.

"Use single back gas" option simplifies gas content changes for profiles that use only one back gas. Changing back gas content for any of the dive segments automatically propagates the change to all of them. Turning the option off allows for the use of travel gases as each dive segment can use different gas.

In dive settings (VPM Settings tab) check the "Manually control advanced settings" checkbox and then turn off the "Use Boyle’s law compensation" option to instruct the program to use VPM instead of VPM-B.

There is no generally accepted physical model of this phenomenon and therefore ICD warnings are not included in the program. Divers aware of the existence of this problem can plan to avoid it by following common sense, rules of thumb or using helium-based deco mixes for deeper stops (e.g. GUE standard gases). Those not aware wouldn’t believe us anyhow :)

1) Define a list of deco gases for a dive
2) Right click in the list
3) From the context menu pick "Set as default deco gas list" option.
The saved list will be automatically loaded into every new dive.