Slow down, damn it. What is a navigation voice package?

This sentence comes from the navigation voice package.

According to the query of Gaode Map app, after opening the application, voice packets will enter the voice packet navigation page, where you can see different voice packets and their corresponding navigation functions.

Select the voice package you like or need, and then click the download button to download it. After downloading, click the Enable button next to the voice package name to set the voice package as navigation voice.