AbstractAnew radio sextantoperating in the 2 cm wavelength region has been completed by the Collins Radio Company. It forms a part of the Ships Self‐Contained Navigation System (SSCNS) being developed for the Naval Ships System Command by the A. C. Electronics Division of General Motors. A novel gimbal system and recent technological improvements have made possible order of magnitude reduction of weight and volume, increased pitch and roll range and greater convenience in operation. All‐weather solar and lunar altitude and bearing data can now be made available for use in an independent, passive navigation system which furnishes position, attitude and velocity on a continuous basis with essentially global coverage. The radio sextant characteristics make it practical for use on most naval vess