A car navigation system by a smart phone is newly developed, and it is expected that the navigation system can give more convenient and assistant information to drivers. However, sometimes the navigation system may become a disturbance to the drivers, and cause distraction during driving, which may result in a traffic accident. Therefore it is an urgent work to evaluate safety of the car navigation system by a smart phone. A car navigation system was integrated into an advanced driving simulator, where the car navigation system can be utilized during driving for studying drivers’ behaviors. The driving experiment was successfully completed by changing the position and size of the display of the navigation system, and driver’s behaviors were recorded. The experimental results indicated that safety of the car navigation system can be evaluated by using the driving simulator.