Port IdentificationItem DescriptionFUSE Contains the 15 A fuse for the device.Not used.Connects the stereo to the auxiliary in and zone 1 line/subwoofer out wiring harness.Connects the stereo to a typical AM/FM antenna using a Motorola type antenna connector.If you are installing the stereo on a boat with a metal hull, you must use a ground-dependent antenna,and if you are installing the stereo on a boat with a non-metal hull, you must use a ground-independentantenna. See the installation instructions provided with your antenna for more information.Connects the stereo to the power and speaker wiring harness.4 Fusion MS-RA60 Installation Instructions

Garmin Fusion MS-RA60 Installation Instructions Manual