What kind of navigation does the TH-73 NOT primarily rely on for effective operation?

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The TH-73 primarily relies on satellite navigation, visual navigation, and inertial navigation for its operational effectiveness. Satellite navigation systems, such as GPS, provide precise positioning and timing information essential for flight operations, while visual navigation allows pilots to orient themselves based on visual references from the ground. Inertial navigation systems use onboard sensors to calculate the aircraft's position based on its velocity and orientation over time, which is crucial for maintaining situational awareness during flight.

Acoustic navigation, on the other hand, is not a primary means of navigation for the TH-73. This method typically involves using sound waves to determine location, which is more commonly used in underwater navigation systems for submarines and other aquatic vehicles rather than in aircraft. Thus, the TH-73 does not leverage acoustic navigation for its operations, making it the correct choice in this context.