1. Open the Google Maps app, and tap on Menu (three vertical bars shown in the upper left corner)
2. Tap on ‘Setting’ and in the settings menu, tap on ‘Navigation settings’.
3. In the ‘Navigation settings’ menu, tap on ‘Voice level’.
4. The default setting value is ‘Normal’. Select the required voice level – Louder, Normal or Softer – as per your requirement, and then close Google Maps app.
Note that, the differences between the three voice levels are significant. If you want a louder voice, choose the first option ‘Louder’ and then close Google Maps app. 

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