RDS is Radio Data System. In Europe, there are multiple stations carrying the same "network" if you will, and as you drive around, the radio will jump to the station with the strongest signal. You also get the name of the station, and sometimes the song playing. In the US, most stations are unique, so you don't get the hopping. The CD23 is annoyingly slow changing channels when you turn on RDS, I think it is scanning all channels for matches (at least the Euro version I have does). I will be selling this on eBay shortly.Originally Posted by Steven G