When you arrive in Corrençon-en-Vercors, cross the village completely heading south. There are car parks at the foot of the golf course and the lodge (avoid the car park overlooking the golf course, which is reserved for golf course members).
(S/E) From the car park, take theGR®91southwards. This is a stony path that passes between the lodge on the right and a tarmac track on the left reserved for roller skiing.
TheGR® is marked in red and white.
Throughout this first part of the route, which leads to the 45th parallel, follow the signs and arrows indicating this site. Follow or cross the roller ski track in places. The main direction is south/south-west.
(1) At the crossroads, turn left (there is a small chalet slightly higher up on the right). Continue straight ahead, leaving the biathlon stadium on your right.
At Champ de la Bataille, with the golf course on your left, continue along this main track until you reach a crossroads indicating the direction of Chalet du Clarian on your right.
(2) Leave this road and continue straight ahead.
(3) At the Croix de la Messe crossroads, turn right, leaving the next paths on your left and right. In some places, the path climbs steeply and narrows. Pass Les Ravières.
(4) At the Platières crossroads (marked Camp 2), which indicates Lautaret on the right, turn slightly left to reach the 45th parallel site.
(5) Turn around and head back to the Platières crossroads.
Yellow and green markings
(4) Take the path on the left that climbs through the vegetation. Follow the main trail, which is often in the undergrowth. The markings are regularly painted on tree trunks.
(6) When you reach the boundary markers, turn sharply left onto the ascending path. The path is well marked and flat at the beginning, then descends steadily to the Chalet du Clariant. Pass between the statue of the horse and the chalet. Turn left, keeping the chalet on your right. The trail climbs, sometimes difficult to find among the various paths, but follow the yellow and green markings painted on the trees.
(7) At the end of this climb, you will come out onto the main track which descends back to the starting point. Cross the roller ski track twice. At some junctions, stay on the main path.
(1) Turn left and take the path you started on, heading northeast to return to the car park.
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. Three useful comments or clarifications 

