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The Navigation SDK enables you to update the locale and units system to match your user’s preferred settings.

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Updating locale

To update the locale to match the user’s preferred locale, you can use the TomTomNavigationManager class: 
await TomTomNavigationManager.instance.setLocale(const Locale('en', 'US'));

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Updating units

To update the unit system (such as metric or imperial), you can use the TomTomNavigationManager class as well: 
await TomTomNavigationManager.instance.setUnitsSystem(UnitsSystem.metric);
Availble values are: metric, us, or uk.