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[[Image:TDC innerds.JPG|thumb|right|A look inside the TDC showing the motors driving the Position Keeper. <!-- Ref: http://www.maritime.org/doc/tdc/pg105.htm -->]]
To accurately compute the gyro angle for a torpedo in a general engagement scenario, the target course, speed, range, and bearing must be accurately known. During World War II, target course, range, and bearing estimates often had to be generated using periscope observations, which were highly subjective and error prone. The TDC was used to refine the estimates of the target's course, range, and bearing through a process of
*estimating the target's course, speed, and range based on observations.
*using the TDC to predict the target's position at a future time based on the estimates of the target's course, speed, and range.
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