In reply to simon manc:
The only places to stock up supplies I used on this part of the route were in Salardu and 20km(hitchike) down the valley from campsite at Graus. Meals provided at Certascan and in Andorra at the Sorteny and Juclat -both of which are now very swish manned refuges and cheaper than the French or Spanish ones. You will find left behind food at the Pujol and Cinquantenari, ok if you still like chicken soup,tuna and pasta by this time.
I used maps all the time although I had to improvise to Alos de Isil as my route went off the bottom of the map.Never had to use my compass or even bothered with GPS.
I think that most people have done their own version of the HRP to allow for conditions mine includes bits of the GR10 and 11 and a few other variations. Enjoyable and quite 'out there' at times. Take crocs for stream wading.