You want to use a navigation device mounted on your motorcycle. What should you observe?

The selected combination is valid as it covers crucial aspects of safely using a navigation device while operating a motorcycle.

1. Entering the destination while the motorcycle is stationary is important to prevent distractions that could lead to accidents while driving.
2. Avoiding operation of the device while driving minimizes the risk of losing focus on the road, which is a key principle in maintaining safe driving conditions as outlined in German traffic regulations.
3. Utilizing the voice output function integrated into the headset allows for easier navigation without needing to look away from the road or hands from the handlebars, thus adhering to safety guidelines.

Overall, these points align with the emphasis on safety and responsibility in German traffic laws, which aim to ensure that all drivers remain fully attentive to their driving tasks.