Which practice involves using radio to communicate with search and rescue forces?

The correct practice that involves using radio to communicate with search and rescue forces is Search and Rescue (SANDR) coordination via radio. This process includes the use of radio communication to effectively coordinate rescue operations, ensuring that all parties involved are informed and able to align their efforts for the best chance of a successful outcome.

Search and rescue operations rely heavily on effective communication between various units and agencies, which can include maritime, aerial, and land-based resources. The use of radio allows for real-time updates and coordination, vital in emergency situations where timely information can significantly impact the effectiveness of the rescue operation.

In contrast, distress signaling is primarily focused on sending an alert to indicate that a vessel is in immediate danger and requires assistance, rather than the coordination process itself. Routine communication doesn't relate to emergencies or the specific collaboration needed for a rescue operation, while emergency position reporting serves to inform authorities of a vessel's location in distress but does not itself constitute the active coordination necessary for search and rescue efforts.