Devices like or Navtool plug into the back of your Japanese DVD nav unit. They trick the system into accepting HDMI input. Then use Google Maps voice navigation via your phone.
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Free downloads often mix voice data from a 2012 Toyota Prius with a 2018 Subaru Levorg. The result? The system speaks random numbers or Japanese kanji instead of street names. Devices like or Navtool plug into the back