rdf

I was cleaning out the attic at my mother's new house and I found this old ray jefferson model # 483 radio direction finder.(pictures attached) At first I thought it was some communication device for ET but after a little research I found out a little about it but i'm trying to determine if it...

Hi everybody, Does anyone know what sort of RDF capability the Coast Guard has, in general? Do they have the ability to locate an RF signal source on a given VHF marine voice channel? Also, is RDF being incorporated as a feature of Rescue 21? Thanks in advance! :)