4/06 MHz

Why are we celebrating search & rescue technologies on 4/06? The special radio frequency transmitted by emergency beacons is 406 MHz! Learn about how we work w/ @NOAA, @USAirForce, @USCoastGuard & others to coordinate these search & rescue efforts: https://t.co/WVZGhlaiHa pic.twitter.com/2a6g9N1UtP

— NASA (@NASA) April 6, 2018