How can rescue personnel detect that a SART is transmitting in the immediate vicinity?

The correct answer highlights the visual representation of a SART's signal on the PPI (Plan Position Indicator). When a SART is activated in the vicinity of a radar system, it emits a series of pulses that are detected by the radar. This results in the appearance of dots on the screen. As the SART's signal is further interpreted by the radar, these dots will begin to change shape, transforming into arcs as the distance from the radar changes and eventually forming concentric circles when the radar is directly aligned with the SART. This visual cue is crucial for rescuers, as it signals the presence of a SART and indicates that assistance may be needed.

Understanding this phenomenon is important for search and rescue operations, as it allows personnel to visually confirm the presence of a distress signal and to accurately determine its location. The conversion of the dot signals to arcs and then to concentric circles serves as a clear and immediate way to identify a SART's activity on radar systems, aiding the rescue process.

The other options, while related to SART functionality, do not accurately describe how rescuers can visually confirm the SART's transmission through radar. For example, while the DSC (Digital Selective Calling) unit may interact with signals and sound