8. A guidance system as recited in claim 2 wherein said second storage means stores a set of control output membership functions and said second selection means combines the sensed linguistic variables to produce at least one corresponding control output linguistic variable and produces the control output based upon the control output membership functions corresponding to the at least one control output linguistic variable.
8. A guidance system as recited in claim 2 wherein said second storage means stores a set of control output membership functions and said second selection means combines the sensed linguistic variables to produce at least one corresponding control output linguistic variable and produces the control output based upon the control output membership functions corresponding to the at least one control output linguistic variable. 9. A guidance system as recited in claim 8 wherein said second selection means includes means for selecting a control output linguistic variable according to a set of logical rules.