This paper discusses the technical, administrative and certification compat
ibility issues associated with satellite augmentation of GPS/GLONASS. It in
dicates that the Signal-in-Space specifications are central to compatibilit
y and interoperability. IC AO Standards and Recommended Practices are a key
mechanism for interoperability. The paper recommends that one standard be
implemented worldwide. It also urges a mechanism for the co-ordination and
management of augmentation services.