Go to Le Habert in the commune of La Ruchère near Saint Pierre d'Entremont in the Isère department.
Park in the large car park near a large building.
(S) Retrace your steps for about a hundred metres to take a southbound path that climbs to the Col de La Ruchère.
A little higher up, at an altitude of 1,200 metres, a sign curiously indicates "Parking".
Continue along the path, which sometimes passes below steep slopes where snow slides are possible, so be careful and keep your eyes open.
The path passes by the Oratoire Teste de Lavines. Continue for 500 metres.
(1) Below the Col de La Ruchère, take a path on the right that climbs north-west to the Col de Tracol (1,415m). You have just taken a section ofthe GR® Pays de Chartreuse trail. Stay on thisGR® for a short while longer and descend into the valley.
(2) Turn left, leaving theGR® which descends towards the resort's Nordic centre.
Soon, a small sign will indicate that the route is no longer marked.
Then head south towards the Col de l'Aliénard via a superb valley.
(3) At the Col de l'Aliénard (1,520 m), note the nearby ruins and make a short return trip to the ridge on the eastern slope for a view of the Grand Som.
(4) Descend towards the ruins and take the path that heads south through the forest towards Habert de Billon.
(5) At the edge of the forest, you will soon see the Habert building, dominated in the distance by the Pointe de Chamechaude.
Then rejoin theGR® Pays de Charteuse trail to climb north/east via the Prairie de la Folie to the Col de la Ruchère (1,407 m).
(6) From this pass, head north-west to quickly rejoin the route taken on the way up, which you simply follow to return to the car park (E).

and also because the slope above us was less steep (safer?).
