I suspect not.
Ken, when we purchased our new 2006 Beneteau 473 it had a RC520 already installed, black and white I believe, at the helm and RL70c with radar down below in the nav station. We wanted to have equal access to radar and GPS chartplotter data at both stations and we wanted both to be in color. They said the 520 could not receive the radar because it needed HSB2 (High Speed Bandwith) cable to move the large amount of data between the two and the 520 was monochrome anyway.We negoiated to have two RL70RC's installed and the HSB2 cable network as part of the purchase deal. By the way they said the extra cost of the HSB2 cable network alone was $450.00 (which we did not have to pay either).So, I expect the answer you will get is yes, if you want to spend the money for rewiring a new network to a discontinued chartplotter display. I am not convinced even with the HSB2 network that you could display radar data on the 520.That's the best I can do, hope it helps.Rich