Park in the car park at the entrance to the Col du Rousset tunnel, coming from Die.
(S/E) Head towards the via ferrata, but immediately take the path that climbs up to the right through the scree (following the red and whiteGR® trail) and climb towards the Col de Rousset.
After 500m, at an altitude of 1367m, above the tunnel, climb left towards the But de Nève (small wooden post) in the forest; at the edge of the forest, follow the cairns in the open and the ridge to the summit.
(1) Continue straight ahead a little further until you see the signpost for the Col de Chironne.
(2) Leave the path that climbs directly towards the But de l'Aiglette in the open and follow the shepherd's 4x4 track that joins the Chironne signpost on a forest road (yellow and green marks from time to time); follow it and join another forest road at a hairpin bend.
(3) Turn left and follow this forest road to the end; it turns into a small path that comes out into the open with a view of the But Saint-Genix and the Col de Vassieux (picnic spot). Follow this path to the left towards the But de l'Aiglette, along the ridge through a small wood.
(4) Follow the ridge to a solitary tree: picnic spot with views of vultures! Follow the yellow trail towards a large cairn: view of the Col de Rousset road.
(5) From the cairn, do not follow the cliffs but descend towards the forest and join a forest road that passes below the Bergerie de Chironne and join the GR® on the right.
(6) Descend to join the transhumance path carved into the rock (very passable), pass under the via ferrata and return to the car park.
