Hover hold aid systems for helicopters are described. One system comprises a navigation system that determines a helicopter's current position in relation to a terrestrial frame of reference and a helmet-mounted visualization system comprising a helmet-mounted display (HMD) and at least one symbol generation processing device that generates symbols in the HMD at fixed positions in relation to the terrestrial frame of reference. The symbols are displayed in an angular field of display of the HMD. When the helicopter has to home or stay in a vicinity of a predetermined position, the at least one symbol generation processing device calculates a first and a second representation containing a first target and a second target referenced in the terrestrial frame of reference. The first target is located in the direction of the homing course to the predetermined position. The second target is located in a direction perpendicular to this same course.