Essential requirement for walking/climbing Cadair Idris. We used this map extensively and found it invaluable. The standard OS maps are great but these larger scale maps offer so much more detail and that is what is needed to plan a walk or trek in the mountains of Wales.
This map as with all OS Maps has all the information you need when going walking/trekking. Some of the illustrations are a bit small to read at times (especially if your eye sight is not good) but really useful.