[Feature request]: Add support for setting locale/language in Google Maps navigation UI

[IvelinKrastev]

Is there an existing issue for this?

• I have searched the existing issues

Use case

When using google_navigation_flutter, the language of the navigation UI (e.g., turn-by-turn voice guidance, on-screen text) defaults to English. However, many apps need to offer navigation in a different language than the system language — for example:

• Multilingual apps where users select a preferred app language
• Touristic or travel apps that provide guidance in the user’s native language
• Accessibility scenarios where voice directions in a specific language are required

Currently, there is no option in the Flutter plugin to override the locale passed to Google Maps navigation, which limits flexibility and breaks language consistency within the app.

Proposal

Add a locale or languageCode parameter to the GoogleMapsNavigator. This value would be passed to the underlying navigation engine (iOS/Android) to control spoken instructions and on-screen text.

[illuminati1911]

@IvelinKrastev Thank you for the feature request. Currently some parts of the navigation default to English/are only available in English but voice guidance/map itself may be in the system language if available (e.g. Japanese has Japanese language map + voice guidance but UI elements are in English).

As for being able to manually set the language from the Flutter SDK, I don't think the native SDKs support it currently. If they will in the future we'll very likely provide that functionality for the Flutter SDK as well.

[IvelinKrastev]

Hey, thanks for the answer. So, if I have an in-app language change, I will not be able to manually set the language of the UI elements or the guidance, correct?

[jokerttu]

@IvelinKrastev
The Navigation SDKs for Android and iOS use the system language for guidance and other UI elements.
Since this package uses these native SDKs internally, and they do not provide a way to force a specific language, you need to instruct users to change the device language if they want to change the navigation language.

[IvelinKrastev]

@jokerttu
Thanks for the clarification. That sounds fair enough. Do you want to close this issue, since this SDK depends on the other two?