But, be aware that conditions on the tops can be markedly different from those in the valleys and can very rapidly deteriorate. Adequate clothing and provisions and the ability to navigate using map and compass are necessary. It is easy to become disoriented in mist and, in this empty terrain, a GPS receiver can be a useful additional tool to pinpoint your position. The longer moorland walks do present a challenge and newcomers to rambling would be advised to develop their experience on the less demanding routes first. In an area where there is so much worthy of exploration, the difficulty is not in what to include, but rather what to leave out. This collection has been chosen to explore the many different aspects of the countryside and sometimes include or lie close to another attraction. For example, there are several splendid show caves around Castleton