It worked quite well until I replaced it with the digital readout Datamarine unit we're still using now. I have one of those RDF receivers with the rotating bar type antenna on top around here someplace. It's actually a pretty sensitive receiver. The beacons were mostly phased out and inexpensive LORAN receivers were available by the time I got mine. Prior to that we just had the depth sounder, compass and watch to rely on in limited visibility.