Abstract: A method for helping to keep a drone within an authorized airspace. This method involves displaying several symbols on a display of a path estimator comprising: i) displaying an aircraft symbol showing a current position of the drone in relation to the authorized airspace; ii) displaying a boundary symbol showing a boundary of the authorized airspace in a position in relation to the aircraft symbol representative of a position of the boundary in relation to the current position of the drone; and iii) determining a geometry and displaying a path symbol showing a predicted path of the drone without changing values of an item of speed data and an item of navigation data, the geometry of the path symbol being based at least on the value of the item of speed data and the value of the item of navigation data.