Era has been selected by NAVPortugal to deliver a wide area multilateration (WAM) and ADS-B system for the central group of islands in the Azores. Era's solution will utilize its MSS multilateration and ADS-B system to provide NAV Portugal with highly accurate, reliable and redundant surveillance. Coverage from the solution will ensure safe and efficient coverage of the approach, departure and go-around zones of Portugal's Horta airport and will extend to over 100 nautical miles in most directions, with accuracy sufficient to enable both en-route and approach separation services. Each MSS module is built to IP67standards, ensuring ingress protection against salt water, wind, sand and other contaminants. Additionally, the proposed solution places multilateration and ADS-B receivers on several islands in the archipelago, and will utilize Era's expertise in wide area systems deployment -- using satellite synchronization technology to establish a large area of high-precision surveillance over vast areas of ocean.