This report summarizes the results of feasibility tests to measure the earth's vector magnetic field from a Javelin rocket, and describes briefly the missile and ground electronic systems that have been designed to make the measurement. The program is directed to: Determining the attitude of a Javelin rocket nose cone by means of an electromagnetic attitude sensor using antenna-array signalstrength patterns. Making vector component magnetic measurements within the rocket nose cone by means of switched bias coils and a caesium vapor magnetometer. Encoding and telemetering the resulting information in a format compatible with the existing facilities. Developing computational techniques for reducing the data obtained from the above system. (Author).