Start from Maljasset. The route follows "Tour du Chambeyron" GRP.
(S) Follow the little road that slowly heads up to the north-east. Go past Maurin church and head down towards Ubaye River.
(1) Cross the footbridge over Ubaye River. Start heading east-south-east entering a wooded area. Head up a windy hill leading to an area with lawns to the left-hand side. Head south. Go past "Bergerie Inférieure de Mary" (sheepfold).
(2) Ignore the trail heading off to the right towards Lacs de Marinet, rapidly going past "Bergerie Supérieure de Mary". Head south-east going up a steady slope towards Col de Mary.
(3) Head down due south-east. Cross a ledge. Head downhill again, turn then gradually head off due south reaching a trail.
(4) Promptly leave the trail to head south on a path. Head off to the left (south-east) remaining alongside the right bank of a torrent. Shortly before regain the trail, turn off to the right to reach refuge Campo Base.