What does the term 'lost link' signify in drone operations?

The term 'lost link' in drone operations specifically refers to the loss of communication between the drone and its control station. This critical connection allows the operator to send commands and receive telemetry data from the drone in real time. When a 'lost link' situation occurs, the drone may enter a predefined mode of operation, such as returning to a home position or hovering in place, depending on its programmed safety protocols. Ensuring a stable communication link is vital for effective drone control and the safe execution of missions, making this understanding fundamental to drone operations.

While other options mention important factors in drone operation, they do not encompass the specific definition of 'lost link'. For example, the loss of video downlink would pertain to the stream of visual data from the drone rather than overall communication. Loss of navigational control relates to the drone's ability to manage its flight path, and loss of battery power refers to the drone's energy supply, none of which directly address the concept of communication failure indicated by 'lost link'.