The HON03-F/MM is a "Y" harness designed for spliting the factory wiring harness when installing an interface into a 2003+ Acura or Honda vehicle with the nav option installed, allowing you to keep the nav option functional. Can also be used as a cable extension to help facilitate installation of an interface behind the radio in some instances where extra wiring harness cable length is needed. The cable is 12" inches long, tip-to-tip.