Car park at the Lycée Calvin in Noyon.
(S/E) Head north-east for several kilometres and ignore all other paths.
(1) At this crossroads, continue northwards along the path on the left.
(2) At the crossroads at the place known as ‘Les Cinq Pistes’ (calvary), turn right towards the east for 200 m and continue along the path that extends from there.
(3) At the junction of this track with the main track, turn left heading north, then left and right, and follow this main track to the lake at the hamlet of Les Usages. Continue along this track to the village of Les Usages.
(4) Take the track that climbs along the edge of the woods towards the south-east.
When you reach the isolated houses, climb the slope towards the 155-metre altitude and rejoin the outward route.
(2) Finish the route heading south, in the opposite direction to the outward journey, to the car park at the start (S/E).