Standard Horizon CP180i chartplotter use RS232 standard NMEA 0183 protocol, so you need a Garmin bridge board. https://www.quark-elec.com/product/qk-as03-nmea0183-to-garmin-bridge-board/” class=”bbcode_url”>https://www.quark-elec.com/product/qk-as03-nmea0183-to-garmin-bridge-board/