What is a secondary unit in SAR operations when the primary unit is not available?

In Search and Rescue (SAR) operations, the concept of a secondary unit comes into play when the primary unit is unavailable due to various reasons such as mechanical failure, weather conditions, or operational constraints. In this context, a SAR helicopter serves as a highly effective and versatile secondary unit.

The SAR helicopter is designed for rapid response and has the capability to reach areas that may be inaccessible by ground or water-based units. It can cover large distances quickly and is equipped with advanced technology for locating and rescuing individuals in distress. With the ability to deploy downed personnel, drop survival equipment, and conduct aerial searches, the SAR helicopter is an essential asset in emergency situations, particularly in maritime or difficult terrain scenarios.

Other options like a RHIB (Rigid Hull Inflatable Boat), aerial drones, or coastal patrol units may also provide assistance, but they do not possess the same level of versatility and rapid deployment capabilities as a SAR helicopter. Thus, it stands out as the appropriate secondary unit for SAR operations when the primary unit is not available.