Used on an/wsn-7 (v) 1, subsurface ring laser gyro inertial nav sys; an/wsn-7 (v) 2, surface ring laser gyro inertial nav sys; an/wsn-7 (v)1, surface ring laser gyro inertial nav sys; computer, an/uyk-44(v); los angeles class ssn (688); an/wsn-7 (v)2, subsurface ring laser gyro inertial nav sys; spruance class dd (963); virginia class cgn (41); an/wsn-7 (v) surface 3 ring laser gyro inertial nav sys; ticonderoga class cg (47). 1.980" overall length weapon system essential