(S) From Artigues, rejoin the GR®10 Accès, turning right towards the west.
(1) Cross the D918 road heading up towards the Tourmalet, then follow the GR® route to the right just before the bridge over the Adour d’Arizes. Head towards the Pic du Midi de Bigorre.
(2) Cross the Pont des Vaquès over the Adour d’Arizes, then continue to the right along the GR®10 Accès towards the Pic du Midi de Bigorre as far as the Col de Sencours (site of the very first observatory before the one at the summit of the Pic du Midi de Bigorre was built).
(3) Cross this pass, then head down to the left, passing above Lac d’Oncet on a wide path. Up there, take full advantage of the exceptional 360° view, then head down, skirting around Lac d’Oncet and following the old Route du Pic du Midi. Leave this road to the right and head down following the GR®10 Accès. You’ll come to a fork and a cross-country path.
(4) Turn left, then, about 200 m further on, continue straight ahead on the GR®10 Accès. Do not take the path that branches off to the left. Descend to the Tournaboup car park (E).