Park in the car park at the hamlet known as Le Pont des Allemands, in the hairpin bend before La Correrie.
(S/E) Start by crossing the road and taking the wide track on the left. Begin a steep climb. Gradually, the track narrows to give way to a good path. Make a wide circular loop to the right, cross a stream and then follow the edge of the fields to reach the Habert de Chartroussette.
(1) Continue by turning left onto the wide path, stay on this path to reach a wide track. Take it to the left, reaching a large, well-maintained clearing. Turn right into the meadow and then follow the wide path, first in open country then through the woods. Via a fairly steep climb, reach a clearly marked Y-junction.
(2) Turn right onto this wide path. Continue up a gentler slope, then along a virtually level path, finishing with a descent to reach the junction with the Col d’Arpison trail.
(3) Turn right onto this path, continue the descent, and reach the Habert du Billon.
(4) Go round it, return to the track leading to it and turn right. Stay on this track and, a few metres further on, turn left and take the Chemin du Pavé, marked in pale yellow. Continue the descent to rejoin the track leading to the Grande Chartreuse Monastery.
(5) Turn right onto this wide, well-maintained track and follow it to the monastery. Walk alongside it until you reach the Y-junction where the two roads meet.
(6) Take the right-hand road and complete the descent to return to the car park at a place called Le Pont des Allemands (S/E).