Which system is commonly utilized for backup navigation in the TH-73?

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The system commonly utilized for backup navigation in the TH-73 includes a combination of several methods, making "all of the above" the most appropriate answer.

Visual reference systems offer pilots the ability to navigate using landmarks and other visual cues, providing a backup option when electronic systems may be unavailable or compromised. GPS is a primary navigation tool equipped in many modern aircraft, serving as a reliable source for precise location data; however, it is important to have backup systems available. Traditional navigation aids, such as VOR or NDB, serve as additional layers of navigation that pilots can rely on should GPS signals be lost.

Utilizing all of these options effectively creates a comprehensive approach to navigation in the TH-73, ensuring pilots have multiple methods to determine their position and navigate safely. Therefore, the correct answer recognizes the integration of various systems as a best practice for backup navigation.