Peter Robins, his website

The Roads to Santiago - Route Details

GR655 - Tours-Poitiers-Bordeaux-Ostabat
Via Turonensis

North of Bordeaux this has been waymarked as the GR655: from Tours via Poitiers and Saintes as far as the Charente-Maritime/Gironde border (385km - the road is some 100km shorter). A topoguide for this is published by the FFRP. (See other page for route from Paris.) The Amis des Chemins de Saint-Jacques en Vienne website includes an overview of the route in Vienne. There is some information on the route in the Saintonge on the Saintonge en Ligne site and that of the magazine Xaintonge, and on the route in Poitou-Charentes on the Communauté de Communes de Parthenay site. A free map for the section through Charente-Maritime is available from the Conseil Général.
Waymarking from here to Bordeaux should be complete in 2007; a recommended route is on the Via Turonensis site.
In Bordeaux, a route has been signed by the city council and a free leaflet produced. See their website for some further information.
South of Bordeaux, the route has been marked by the Amis de St Jacques. There is a complete guide of the route through the Landes on the Société Landaise des Amis de Saint Jacques site. There is also some outline info on the site of the Landes Conseil Général. The Pyrénées-Atlantiques Amis de St Jacques describe their section in a Guide du Bourdon and on their website.
See Camino Navarro for continuation into Spain.
For more info, including mapping, see Via Turonensis site.

Confraternity of St James produces English: guide | factsheet