Wed 7 Aug 13 Williamthorpe Local Nature Reserve, Mansfield Road car park, between Heath and Temple Normanton S44 5SG Geo-caching is treasure hunting for the 21st century. With easy-to-use, hand-held GPS (Global Positioninf System) unit you navigate to different locations and when you get there you open the cache or find the secret. Come and see if you can solve the clue