Boss Audio Systems BV9370NV User Manual page 55

The 2.5D Landmark and 3D Landmark functions are optional. If you've purchased
these functions, you'll be able to choose these functions:
3D LandMark (enable) 3D LandMark (disable)
9.4 Language
Main Menu ->Settings ->Language
The Language Menu allows you to change the Settings of Polnav for use in different
countries. You can change the Text and Voice prompts used by Polnav. To switch dual
language map's text, please kindly change the Map language from the following screen.
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