Google first, post second. From the FAA website:

The highly precise GPS-based surveillance provided by ADS-B also improves the ability to perform life-saving search and rescue missions. Air traffic controllers tracking aircraft with ADS-B Out have more accurate information about last reported positions, helping to take the "search" out of search and rescue. ADS-B Out avionics transmit data approximately once every second, and therefore enables more precise tracking of aircraft compared with the current radar sweep rates of 3-15 seconds. The smaller footprint of ADS-B ground radios enables their placement in areas where a radar site would be unfeasible, such as mountainous terrain. Air traffic controllers have better information about an airplane's last position, thereby reducing the critical window of time involved in a search and rescue operation.

Surprised that more is not being made of this.