The purpose of this document is to define the concept of the prototype implementation for the Mountain Rescue service concept. It presents a reference scenario based on an analysis of typical search and rescue operations conducted by Mountain Rescue teams in the English Lake District. This document is the conclusion of 18 months of discussions, analyses and lab/field trials. It is also heavily influenced by the requirements and guidelines defined by workpackages 1, 2 and 3. The Mountain Rescue concept outlined in this document serves as a guide for the final implementation and demonstration that will occur in the final 12 months of the project. However, it is plausible that certain technical issues and/or implementation details may be adapted or altered during deployment trials and testing.