Last July, a sailboat with two people onboard caught on fire several hundred miles off the coast of Jacksonville, Florida. Luckily for the crew, a NOAA satellite picked up the distress signal from their emergency beacon, enabling the U.S. Air Force and Coast Guard to rescue them.

NOAA polar orbiting (right), geostationary (middle), and the new GOES-R series (left) satellites are part of the SARSAT constellation. (Image credit: NOAA)