On leaving Gap, heading towards Veynes, take the D503 towards Rabou. Drive through the village, heading north, and park at the car park at the start of the hiking trails.
(S/E) Go through the barrier and follow the Route Forestière de l’Escout (GR®93) northwards until you reach a junction (signposted) at the foot of a wayside shrine.
(1) Leave the GR®93: the famous Sentier des Bans. Take the track that climbs to the right, heading east. Pass the first hairpin bend and climb up to a junction of tracks in a loop.
(2) Turn right, heading east, to stay on the main track until the next Y-junction.
(3) Turn right, heading south-east then east, to follow the track as it makes a wide bend and continues its ascent along the ridge. On this very stony track, the slope rises steeply up the Chaumasse mountain. Generally keep heading north and ignore the faint paths branching off on either side. At the end of the track, you’ll reach a lovely alpine hut which you should go round to the left (next to the ruins of the old sheepfold).
(4) Continue by sight (off the marked path but with no difficulty in finding your way on a clear day), following a track towards the summit of the puy (the marked path goes round the summit to the right). Cross large expanses of grass, dotted only with a few piles of stones, on a climb that remains fairly steep. Reach the ridge and follow it north-east for about 400 m to reach the summit of the Puy de Rabou. Enjoy the view of the Pic de Bure, the Pic Melette and the north-facing slope of Charance.
(5) From the summit, follow the north-eastern ridge, then enter the woods (the route, although not shown on the IGN map, is signposted). Join a yellow-marked path (shown on the IGN map) which circles the puy and passes at the foot of the southern slope of Pic Melette.
(6) Take the path on the left to reach the Col du Ferlieu, in a fairly open area. The view opens out to the east, whilst to the north the ascent to the grassy southern ridge of Pic Melette comes into view. Head south-west to the left, towards the Bois de l’Escout. After crossing the north-western slope of the hill and passing through a ravine (which can be avoided by taking a higher route round the left), you’ll reach the Route Forestière de l’Escout , which turns out to be a track usable only by foresters (rutted and sloping). Ignore the forest tracks coming from the right. You’ll reach a junction of tracks at a bend, just as you leave the forest.
(7) Turn left, heading south-east, to follow the main track towards Rabou. The track, which is suitable for vehicles, crosses a vast landscape dominated by the Pic de Bure and the Barre and Clape mountains. Cross a ravine overlooking the Sentier des Bans. Reach a Y-junction.
(8) Leave the main track (Route Forestière de l’Escout) just before crossing a second ravine. Continue to the right, heading south. You’ll rejoin the track you took on the way up at a bend.
(2) Descend opposite along the reverse route of the outward journey, heading south. Pass the wayside shrine (1) and return to the Rabou car park (S/E).