What signal indicates that the SAR team is within one mile of the SART?

The correct signal indicating that the Search and Rescue (SAR) team is within one mile of the Search and Rescue Transponder (SART) is the transformation of 12 blips into arcs on the radar display. This specific pattern occurs as the SAR team approaches the SART's location. The SART is designed to assist in locating vessels in distress, and when a radar signal from a nearby vessel intersects with the SART's response, it will initially appear as multiple individual blips. As the distance closes, these blips will change into arcs, clearly indicating proximity and alerting the SAR team that they are nearing the target.

The transformation from blips to arcs is crucial for navigators and rescue teams because it provides a clear visual cue on radar screens, enabling them to effectively coordinate their search efforts and quickly locate the distressed vessel. This functionality is essential for successful maritime rescue operations, particularly in time-sensitive situations.