Depends on which unit you have. If you have a CMD4 then you absolutely do have the RCA inputs for an mp3 adapter AND I have one to sell you if you're interested. But it should have an AUX button.
I bought one last year to add a second mp3 port at my helm (only have one in the cabin) but decided to use a bluetooth adapter to play my music. I'll sell mine to you for 25% off retail plus actual shipping.
Which clarion unit do you have? Its easy to look up to see if you have the AUX inputs.
This is what I have.
http://www.overtons.com/modperl/product ... er&i=84601
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Former owner of:
1996 Four Winns Horizon 200 5.8L VP
2006 Four Winns Horizon 260 8.1L VP
2007 Sea Ray 290 Sundancer
Current boat
2004 Sea Ray 290 Sun Sport Twin 350 Mags