Piloting indicator determining the maximum slope for piloting un aircraft during terrain following flight

The indicator has a calculation unit determining, from information issued by an information source assembly, a total maximum gradient of an aircraft. A head-up display device (5) presents, on a visual display unit (7), indication units (8, 10). The indication units indicate the value of the gradient and are presented by superimposing the terrain (12) existing in front of the aircraft. An independent claim is also included for an aircraft comprising a steering indicator.