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More advanced Trimix dives are often planned such that they require a “travel gas” to safely get to a depth where the “bottom gas” can be used due to a low partial pressure of oxygen at the surface. By default, Trimix Tools will post a warning if a travel gas might be required. You can turn these warnings off in the in app “Settings” if you’d prefer not to receive these warnings. Visit Settings and turn the “Low surface PPO2” switch to "Off". This setting will also persist the next time you open the application.