ABOVE IS  A VERSION OF THE MARCONI MARINE ' LODESTONE ' DIRECTION FINDER RECEIVER -THE FORE RUNNER OF THE LODESTAR  RECEIVER.. I SEEM TO RE-CALL THAT BOTH SHAW SAVILL'S MV CANOPIC AND MV CEDRIC HAD THESE FITTED, BUT THESE WERE NOT INSTALLED IN THE RADIO ROOM, BUT IN THE CHART ROOM OF BOTH VESSELS.