radio compass Synonyms

compass ground radio direction finder ground rdf ground-based radio bearing finder ground-based radio compass ground-based radio direction finder ground-based radio direction finding device ground-based radio direction finding equipment ground-based radio direction finding instrument ground-based radio direction finding system ground-based radio direction finding technology wireless compass gyroscopic compass navigational aid instrument needle magnetic compass mariner's compass gyrocompass LORAN rdf SHORAN triangulator direction finder ground-based rdf