When using a **GPS navigator** while driving, it is important to remember that the **driver's judgment** should prevail in case of doubt. This is because the driver has the ability to assess the situation in real-time, considering factors such as weather, traffic, and road conditions, which the GPS might not accurately reflect.

- **Route planning**: Before starting a trip, it is advisable to plan the route using a map. This allows you to choose the safest and most comfortable path, taking into account possible roadworks, weather, and the number of vehicles on the road. This prior planning helps the driver make informed decisions during the journey.

- **Traffic signs**: Just like with traffic signs, where sometimes you have to decide which one to obey in case of contradiction, the driver must use their judgment to determine the best course of action. For example, if there is a green light and a no left turn sign, the driver should obey both signs and choose to go straight or turn right.

In summary, although the GPS is a useful tool, the driver should rely on their judgment and experience to make safe and appropriate decisions on the road.