Yes, this is possible. For the K 1600 GT, K 1600 GTL and R 1200 RT motorcycles, the vocal announcements are played back when connected with the audio system optional accessory via the onboard speakers.
When using the car set for the BMW Motorrad Navigator V (part number 77 52 8 544 460) the vocal announcements are played back via the speaker integrated into the car holder.
Audio System: Option code 268
The audio system features a controlled iPod and mp3/USB interface and is operated via the Multi-Controller.