To drive safely with a portable GPS system, it is essential to **arrange the cables so they do not obstruct driving**. This aligns with the principles of **preventive driving**, which emphasize the importance of avoiding distractions and maintaining a safe driving environment.

- **Vision and distractions**: It is crucial to look in all directions and avoid focusing on things that may distract. Poorly organized cables can be a visual or even physical distraction if they interfere with the vehicle's controls.

- **Space and safety**: Keeping an obstacle-free space inside the vehicle is part of safe driving. Loose cables can become tangled or cause problems when changing lanes or performing maneuvers.

- **Anticipation and reaction**: Having a clear driving environment allows for better anticipation of other drivers' movements and timely reactions, which is essential for road safety.

Therefore, organizing the GPS cables so they do not interfere with driving is a recommended practice to maintain focus on the road and ensure a safe journey.