See also:

Activating HDC
Press the button; the LED above the button lights up. ...

Units of measure
You can change the units for fuel consumption, route/distance, temperature and pressure. 1.  "Settings" 2.  "Language/Units" 3.  Select the desired menu item. ...

Switching the reception on/off
1. "Navigation" 2. "Options" Open. 3. "Receive Traffic Info" ...