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The marine remote commander model RM-X60M is not fully compatible with the CDX-M20 head unit, its buttons operate the CDX-M20 head unit, but since the CDX-M20 does not include a Sony Bus connection, the RM-X60M DISPLAY will not work (i.e., it will not even light up).
The Marine Remote Commander model number RM-X11M is compatible with the CDX-M20 stereo. Go to Parts and Accessories.