To provide a navigation system for a moving body useful to carry out delivery service operation. In one embodiment, three images to be compared are displayed at matched positions on an image display after going through the position-matching process conducted by the position matching means, in which the vertical positions of a structural feature area of the object are aligned horizontally. In a complementary method, an access terminal obtains the sequential measurements chosen by the access point. The processor limits electric motor torque and speed based on operator commands for speed and torque in said pulling mode; and, the processor controlling electric motor torque in the tensioning mode. A viewing direction of the sensor may be adjusted based at least in part on the composite likelihood. A built-in self test circuit is provided that decouples a clock signal used for receiving data from a clock signal used in transmitting data.