The MD36 Solid State Interface range of units is designed for applications where the need is for low power retransmission. It makes an easy task of incorporating a piece of equipment into a larger system which operates on a different transmission standard. The MD36 is a compact and robust unit which is easy to install especially in applications where space is restricted. The MD36/8/ST is used as an interface between a gyro compass or TMC that provides a digital output,(NMEA format RS422 transmission standard), to receiving devices such as, a variety of displays or other navigational aids, that require a step input.. When suitably adjusted the MD36/8/ST reads the transmitted heading with no errors and transmits it's step output to within 1/6º.