3. A guidance system as recited in claim 2 wherein said sensing means additionally includes means for determining the difference between the sensed bearing signals and the rate of change of the bearing signals difference and wherein said first and second sensed linguistic variables and membership function sets correspond to the difference in the bearing signals and the rate of change in the difference of the bearing signals.
3. A guidance system as recited in claim 2 wherein said sensing means additionally includes means for determining the difference between the sensed bearing signals and the rate of change of the bearing signals difference and wherein said first and second sensed linguistic variables and membership function sets correspond to the difference in the bearing signals and the rate of change in the difference of the bearing signals. 4. A guidance system as recited in claim 3 wherein said steerable object includes a guidance point spaced a predetermined distance from the steerable object along its longitudinal axis of motion and said sensing means produces bearings to said object and to said guidance point, said difference means taking the bearing signal difference as the difference between the bearing to the guidance point and the bearing to the second site and taking the rate of change as the rate of change of the difference between the bearing to the object and the bearing to the second site.