WAAS Status -Check for any current or planned outages for your WAAS reveiver. (Link)
WAAS: The FAA plan and design for the overall system
WAAS: What equipment is available today? RayNav 300 for Marine use is one.
WAAS: Why do we need it for aircraft navigation?
WAAS and LAAS: The GAO talks about the funding and politics.
LAAS: FAA shows how it will work