A vision guidance system of an aircraft, the system comprising: a synthetic vision system; an enhanced vision system; a display device defining a display area; one or more data processors operatively coupled to the display device, to the synthetic vision system and to the enhanced vision system; and a non-transitory machine-readable memory operatively coupled to the one or more data processors and storing instructions executable by the one or more data processors and configured to cause the one or more data processors to: cause simultaneous display of a first selectable object and of a second selectable object in the display area of the display device, the first selectable object being associated with the activation of a combined vision guidance operating mode of the vision guidance system and the second selectable object being associated with the activation of a synthetic vision guidance operating mode of the vision guidance system, the combined vision guidance operating mode including use of a combination of synthetic vision and enhanced vision, and the synthetic vision guidance operating mode including use of synthetic vision without enhanced vision; and after a selection of the first selectable object associated with the combined vision guidance operating mode, cause an activation of the combined vision guidance operating mode, after a threshold condition has been met, wherein the threshold condition comprises at least one of an altitude of the aircraft and a distance of the aircraft from a runway; wherein the instructions are further configured to cause the one or more data processors to: while the combined vision guidance operating mode is active, determine that an enhanced vision system of the aircraft is unavailable; then cause automatic deactivation of the combined vision guidance operating mode; and cause automatic activation of the synthetic vision guidance operating mode. a synthetic vision system; an enhanced vision system; a display device defining a display area; one or more data processors operatively coupled to the display device, to the synthetic vision system and to the enhanced vision system; and a non-transitory machine-readable memory operatively coupled to the one or more data processors and storing instructions executable by the one or more data processors and configured to cause the one or more data processors to: cause simultaneous display of a first selectable object and of a second selectable object in the display area of the display device, the first selectable object being associated with the activation of a combined vision guidance operating mode of the vision guidance system and the second selectable object being associated with the activation of a synthetic vision guidance operating mode of the vision guidance system, the combined vision guidance operating mode including use of a combination of synthetic vision and enhanced vision, and the synthetic vision guidance operating mode including use of synthetic vision without enhanced vision; and after a selection of the first selectable object associated with the combined vision guidance operating mode, cause an activation of the combined vision guidance operating mode, after a threshold condition has been met, wherein the threshold condition comprises at least one of an altitude of the aircraft and a distance of the aircraft from a runway; wherein the instructions are further configured to cause the one or more data processors to: while the combined vision guidance operating mode is active, determine that an enhanced vision system of the aircraft is unavailable; then cause automatic deactivation of the combined vision guidance operating mode; and cause automatic activation of the synthetic vision guidance operating mode. cause simultaneous display of a first selectable object and of a second selectable object in the display area of the display device, the first selectable object being associated with the activation of a combined vision guidance operating mode of the vision guidance system and the second selectable object being associated with the activation of a synthetic vision guidance operating mode of the vision guidance system, the combined vision guidance operating mode including use of a combination of synthetic vision and enhanced vision, and the synthetic vision guidance operating mode including use of synthetic vision without enhanced vision; and after a selection of the first selectable object associated with the combined vision guidance operating mode, cause an activation of the combined vision guidance operating mode, after a threshold condition has been met, wherein the threshold condition comprises at least one of an altitude of the aircraft and a distance of the aircraft from a runway; wherein the instructions are further configured to cause the one or more data processors to: while the combined vision guidance operating mode is active, determine that an enhanced vision system of the aircraft is unavailable; then cause automatic deactivation of the combined vision guidance operating mode; and cause automatic activation of the synthetic vision guidance operating mode. while the combined vision guidance operating mode is active, determine that an enhanced vision system of the aircraft is unavailable; then cause automatic deactivation of the combined vision guidance operating mode; and cause automatic activation of the synthetic vision guidance operating mode.