Start on the D29, 500m before Le Chiroulet (altitude 1064m).
(S) Follow the track that climbs north-east.
(1) After two hairpin bends, at an altitude of 1,420 m, take the path that climbs north-west. There are cairns along the way.
N.B. It is also possible to follow the path from the first hairpin bend, near the Ruisseau de Jammes stream. The path crosses the track in several places. It is very visible and marked with cairns, but the slope is steeper than on the track.
You will reach Courtaou de la Lit after about an hour and a quarter's walk from the start. This is a group of flat stone huts that can be used as shelter in bad weather.
From the huts, the path continues north and then west. You cross the Riou Grande stream at the foot of a waterfall. The path continues west towards the hut at an altitude of 1,640 metres.
(2) From this hut, the trail is no longer marked with cairns. Go around the hut to the north and find a path at an altitude of 1,650 metres. Follow this path heading southwest, cross a small stream below a waterfall and continue to an altitude of 1,730 metres. Then turn 90° and follow a small path that climbs up the northwest side. This path disappears near the 1,791-metre mark.
The rest of the route is off-trail. Continue north, cross a small stream and follow its left bank to a spring at an altitude of 1,840 metres.
(3) After the spring, climb north-east to reach a gap in the north-west ridge of Pic Saint-Vincent, which you will reach in 5 minutes.
(4) From the peak, return via the same route (E).