Cospas-Sarsat’s second-generation Geostationary Orbit Search and Rescue system, known as GEOSAR, involves a constellation of six geostationary satellites that provide continuous coverage and the ability to quickly alert a ground station to an active 406 MHz signal. Unlike LEOSAR, GEOSAR satellites can’t use Doppler processing to self-calculate a beacon’s position, so contemporary EPIRBs and PLBs, including ACR’s GlobalFix Pro, which Leopard’s crew used, include a built-in global navigation satellite system (GNSS) receiver, allowing the beacon to determine its exact position information from GPS (United States), GLONASS (Russia) or Galileo (EU) satellites. The position fix is then sent by the rescue beacon to the satellite and relayed to the appropriate rescue agencies. While GNSS information dramatically reduces the amount of time it takes for rescuers to arrive on scene, not all EPIRBs are currently required to carry GNSS receivers. When buying a rescue beacon, it’s important to know if it includes this feature.