This is a real walking guide, with detailed maps for each section of this 44-day odyssey. Like any walking guide, the real review can only be written after the reader has "walked the walk", so this reviewer has to be careful to say that, in the planning stage, this book certainly seems to have been very well researched. Each day's route is carefully laid out, with a description of the shortcomings of the signage and the alternative routes. Since the GR11 takes one away from what passes as "civilisation" for days at a stretch, the detailed information about where the route intercepts shops, campsites, huts and bothies is invaluable in planning the kit requirements. Armchair walkers might find the small format difficult to read, but on the trail the small size will come in to its own. I have searched high and low for English language material on GR11, and this really does seem to be the definitive guide. Don't leave home without it!