I've got a Raymarine RL70RC (monochrome) and the RL70CRC ( color) both of which are chartplotter and radar capable. If you presently have a radome, it may not be compatible with the Raymarine C and E series displays. Contact Raymarine with the serial number of your present radome and they will tell you if it will work. Some of the older radome will work with all models mentioned. My radome would work with the C and E series displays, even though I purchased it for the RL70RC. Why do you want to upgrade? If you want color, you could pick up a RL70CRC color display on ebay. They are great units and reasonably priced.