NAVIGATION SYSTEM AND METHOD OF A MOBILE VEHICLE ADAPTED TO DETERMINE AND TO DISPLAY A SECURITY NAVIGATION ZONE

The invention relates to a system and a method for the navigation of a movable vehicle, suitable for determining and displaying a safe navigation zone for the movable vehicle. The navigation system comprises a dead reckoning navigation system, (10), a calculator (50), a storage memory (60), an on-board sensor (20), and an electronic mapping system (70). According to the invention, the calculator (50) is suitable for calculating an estimated position of the movable vehicle from speed and/or acceleration measurements and a comparison of the measurement of an environmental parameter with a geographical database. The calculator (50) is suitable for calculating the probability density of the presence of the movable vehicle around each point on the map in order to deduce a safe zone (12) corresponding to a presence probability higher than, or equal to, a pre-determined threshold p.