2. Find the download website or channel of navigation voice package: You can search keywords such as Harvard M6 navigation voice package download on the Internet to find relevant download websites or channels.
3. Download the navigation voice package: after finding a suitable download website or channel, download the corresponding navigation voice package according to the tips or requirements of the website.
4. Install the navigation voice package: After downloading, install the navigation voice package into the navigation system of Harvard M6 according to the installation guide provided by the navigation system or website.