A system for automatically modifying a lateral flight plan of an aircraft includes modifying means adapted to modify the flight plan by an action to chosen among the following actions: deleting, adding and moving at least one waypoint of an initial flight plan. The invention provides a black and white photothermographic material having high image quality and an excellent storability, and an image forming method. To be able to support a machine adjuster in the adjustment of positions the invention provides for both the memory unit for the desired positions and each measuring device for the actual positions to be connected to a computing element which calculates the differences between the desired positions and the actual positions. The hand telephone contains an SIM card for telephonic network operation.