Paragliding: Touring the Chartreuse range (87km cross crountry flight from St Hilaire)

18 August 2020, I'm hiking up from Lumbin to take off from the South Take off of Saint Hilaire du Touvet with other members of the Zeleph & DUCK free flying associations. We first head south on the east facing ridges before flying to Aiguebelette.
I don't know the way back! I improvise with Gontran a way back through the Beauvoir / Grand Som / Scia and Piton de Bellefond.
One of my best flight to date...