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[[Image:FiringGeometry.png|noframe|thumb|Figure 2: Illustration of general torpedo fire-control problem]]
A straight-running torpedo has a [[gyroscope]]-based control system that ensures that the torpedo will run a straight course.<ref name="straight">Straight after an initial turn to course, as explained below.</ref> The torpedo can run on a course different from that of the submarine by adjusting a parameter called the gyro angle, which sets the course of the torpedo relative to the course of the submarine (see Figure 2). The primary role of the TDC is to determine the gyro angle setting required to ensure that the torpedo will strike the target.
Determining the gyro angle required the real-time solution of a complex [[Trigonometry|trigonometric]] equation (see Equation 1 for a simplified example). The TDC provided a continuous solution to this equation using data updates from the submarine's navigation sensors and the TDC's target tracker. The TDC was also able to automatically update all torpedo gyro angle settings simultaneously with a fire control solution, which improved the accuracy over systems that required manual updating of the torpedo's course.<ref name=AutomatedGyroSetting>{{harvnb|Friedman|1995|p=196}}</ref>
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