How to install Android 4 4 map navigation on car stereo

Tyson said Also, after the 4.4 upgrade I no longer have navigation app. Do you have an .apk for the navigation app? Thanks for all the help!

So how to slove this issue? About navigation app, please make sure the navigation maps in the sdcard, then put it into GPS card slot

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Then here is a video to show it, you can install it.