Concerns that tachyons, which have imaginary mass, may violate causality have been been discussed in the context of two distinct embodiments for constructing a message loop. One employs transmitters in motion relative to receivers, while the other has transmitters and receivers at rest with each other and messages are passed between moving observers using electromagnetic signals. The latter (Method II) is of interest only to those who seek to disprove the existence of faster-than-light phenomena by constructing hypothetical thought experiments based solely upon kinematics that purportedly violate causality, often by specious means. The former (Method I), on the other hand, is based upon the wider foundation of both kinematics and dynamics, and sound analysis proves that causality is not violated. For Method I, the relative speed between transmitter and receiver limits the propagation speed according to u = c^2/v, where u is the maximum possible propagation speed and v is the relative speed between transmitter and receiver. This paper discusses this paradigm for communicating between outposts in different star systems. Techniques will be discussed for increasing propagation speed beyond that limited by the relative motion between earth and a planetary base in orbit around a distant star.