A system (1) for aiding navigation includes an airport navigation device (2) to generate a ground route within the airport for an aided aircraft, a device (3) for determining the current position of the aided aircraft, a traffic surveillance device (9) for determining the location and type of nearby aircraft, a computation unit (10) for determining, for each segment of the ground route congestion information as a function of the position, type and speed of the nearby aircraft on each of the segments, and a display device displaying an airport map, the current location of the aided aircraft and congestion information for each segment.