Nondirectional Beacon An L/MF or UHF radio beacon transmitting nondirectional signals whereby the pilot of an aircraft equipped with direction finding equipment can determine his/her bearing to or from the radio beacon and “home” on or track to or from the station. When the radio beacon is installed in conjunction with the Instrument Landing System marker, it is normally called a Compass Locator.

"Astronauts demonstrate amazing resilience and adaptability in response to long duration spaceflight exposure. This will enable successful exploration missions with healthy, performance-ready astronauts. NASA is looking to build on what we have learned with additional astronauts in space for more than 250 days. Christina's extended mission will provide additional data for NASA's Human Research Program and continue to support future missions to the Moon and Mars." Source: Jennifer Fogarty, chief scientist of the Human Research Program at NASA's Johnson Space Center in Houston, commenting on NASA's new schedule and new crew assignments that will include the first flight of NASA astronaut Jessica Meir, an extended stay for NASA astronaut