Abstract: A method and a device for monitoring a region (R) in which a carrier (100) is located, which device comprises a display unit displaying a polar plot (10) having a center symbolizing the current position of the carrier (100) and in which there is placed a first moving-body symbol (1, 2, 3) representing the current position of the moving body (101, 102, 103); the polar plot (10) being surrounded by an annular band (20) of width (l) representing a predetermined monitoring duration and containing second moving-body symbols (1?, 2?, 3?) representative of successive angle readings of the path of said moving body (101, 102, 103).

Abstract: A method of positioning a vehicle (N) that is provided with an electronic processor unit (2) connected both to a nonoptical positioning device (3, 4) and to an optical device (5) for taking external images, the electronic processor unit (2) including a database of landmarks including at least the geographical position of each landmark and a descriptive element describing each landmark, the method comprising the steps of: estimating a first geographical position (P1e) for the vehicle (N) by means of the nonoptical positioning device (3, 4); from the database, preselecting landmarks having geographical positions situated within a predetermined radius around the first geographical position (P1e) of the vehicle (N); selecting the triplets that minimize geometrical errors; controlling the optical device (5) for taking external images to take images of the selected landmarks; selecting images in which the landmarks are indeed visible, identifying the landmarks in the images, and, from the images, measuring a rel

Abstract: A method and a device for monitoring a region (R) in which a carrier (100) is located, which device comprises a display unit displaying a polar plot (10) having a center symbolizing the current position of the carrier (100) and in which there is placed a first moving-body symbol (1, 2, 3) representing the current position of the moving body (101, 102, 103); the polar plot (10) being surrounded by an annular band (20) of width (l) representing a predetermined monitoring duration and containing second moving-body symbols (1?, 2?, 3?) representative of successive angle readings of the path of said moving body (101, 102, 103).

Abstract: A method of assisting navigation of a vehicle, the method comprising the steps of: at predetermined instants, determining first positions and second positions of the vehicle by different positioning means and calculating the discrepancy between each pair of first and second positions; comparing the discrepancy with a warning threshold; defining a reference frame on a screen, the reference frame being centered on a reference point corresponding to the most recent first position; and symbolizing the discrepancies on the screen by allocating a symbol to each discrepancy and by positioning each symbol on the screen, relative to the reference point, while taking account both of the value of the discrepancy and also of the path travelled by the vehicle since calculating the discrepancy, the first symbols being provided with respective chronological indicators.

Abstract: A method of assisting navigation of a vehicle, the method comprising the steps of: at predetermined instants, determining first positions and second positions of the vehicle by different positioning means and calculating the discrepancy between each pair of first and second positions; comparing the discrepancy with a warning threshold; defining a reference frame on a screen, the reference frame being centered on a reference point corresponding to the most recent first position; and symbolizing the discrepancies on the screen by allocating a symbol to each discrepancy and by positioning each symbol on the screen, relative to the reference point, while taking account both of the value of the discrepancy and also of the path travelled by the vehicle since calculating the discrepancy, the first symbols being provided with respective chronological indicators.