Originally Posted by trapdoor

Go into the On-Board Computer option on the widescreen - then press and hold the voice button and say MAP

The screen should then revert to the Nav map - if it does, then you can control the Navi with voice. The Navi commands are quite limited - probably MAP and 'End Guidance' are the only commands I use as the map scale commands are in Meters or Kilometers in the VR module, but in Yards/Miles on the screen!

Anyhow, try the MAP command and report back....