At Col de Porte, park at the top of the ski resort, in the car park of the "Les Trois Sommets" restaurant.
(S/E) Take the road towards the Charmant Som chalets.
(1) After passing the buildings, leave the road and take the forest track opposite. The yellow and red markings ofthe GRP® Tour de Chartreuse are clearly visible. Continue to the Y-junction.
(2) Take the left fork and follow the path to the junction with the signpost for "Plenom", ignoring the paths on either side. Be sure to follow the GPS route carefully, as there are many paths and they are not always clearly marked. Reach the ridge.
(3) Leave theGRP® here and take the yellow-marked trail on the left. Reach the summit of Pinéa.
(4) Walk around the summit to enjoy the wide panorama; the final stretch is steep but not particularly difficult.
Return to the previous junction.
(3) Follow theGRP® Tour de Chartreuse ridge path, marked in red and yellow, straight ahead. Join the D57e road near the Oratoire d'Orgeval.
(5) Leave theGRP® here and take the path on the right that cuts across the bends in the road. Pass under the Charmant Som chairlift and continue to the right, following the old ski slope for a few metres. You will find a crossroads almost directly below the chairlift.
(6) Take this path on the right and you will reach the D57e road again.
(7) Turn left onto it, then alternate with the path that crosses it to return to the initial crossroads you passed on the way there.
(1) Continue straight ahead on the road and follow the same route as on the way there to return to the Col de Porte car park (S/E).