Skyguide's current MSAW system is fairly basic, and is applied around the GVA and ZRH final approach areas. Skyguide's Safety Nets Task Force (SNTF) is conscious of the functional shortcomings in the current MSAW system, and furthermore is aware of a possible future requirement for Skyguide to implement MSAW Swiss-wide. This study investigates the feasibility of extending the implementation of MSAW beyond its current boundaries (to cover areas including Mont Blanc) and the effectiveness of using of digital terrain data.