<P> Satellite processing from all 121.5 or 243 MHz locators has been discontinued . Since February 1 , 2009 , the U.S. Coast Guard only monitors distress signals from emergency position indicating radio beacons that broadcast using digital 406 MHz signals . Digital 406 MHz models became the only ones approved for use in both commercial and recreational watercraft worldwide on January 1 , 2007 . </P>
<P> Satellite processing from all 121.5 or 243 MHz locators has been discontinued . Since February 1 , 2009 , the U.S. Coast Guard only monitors distress signals from emergency position indicating radio beacons that broadcast using digital 406 MHz signals . Digital 406 MHz models became the only ones approved for use in both commercial and recreational watercraft worldwide on January 1 , 2007 . </P>
what is the coast guard emergency hf frequency
what is the coast guard emergency hf frequency
digital 406 MHz signals
digital 406 MHz signals