Location is about 25km east of Valence(Drome).
You'll have to follow the D199 to the summit of the Col de la Bataille. The GC is located on the north-east side of the road so you'll have to walk a short distance through the forest to get there. Tree cover is very dense so you'll have to go to the rocky edge to get a clear reading. Be careful not to fall over cause it's going to take you a very long time before you hit the ground!