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The voice you pick here is used everywhere Siri speaks, including Apple Maps navigation.
To change the language the directions are spoken in, go to Settings → Apple Intelligence & Siri → Language. Note that this also changes the language Siri listens for.
How to adjust the navigation volume: This is set inside Maps.
You can also change it mid-route by adjusting the volume buttons while a direction is being spoken.
Note: you can't install a custom or celebrity voice in Apple Maps — Apple only offers the built-in Siri varieties. That's a feature Google Maps and Waze have offered at times, but Apple Maps doesn't support it.
The closest sibling pages are How to Change Screen Time Passcode? and How to Change WiFi Channel?.
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