Garmin Power/Data Cable f/Fishfiner 300C & 400C & GPSMAP 400 & 500 Series [010-10918-00] Marine Navigation & Instruments | NMEA Cables & Sensors the horn speaker can be

the horn speaker can be used to collect external sounds and transmit them through the built-in speaker with a function called Listen Back

Termination: SO-239 at bottom of antenna

Course Over Ground (COG)

Built-in 66 Channel WAAS GPS receiver

MB-133 belt clip

Garmin Power/Data Cable f/Fishfiner 300C & 400C & GPSMAP 400 & 500 Series [010-10918-00] Marine Navigation & Instruments | NMEA Cables & Sensors the horn speaker can bePower Data Cable Connect or poer your fishfinders and sounders with this power data cable. Compatible Devices: Fishfinder 300C Fishfinder 400C GPSMAP 400 Series GPSMAP 500 Series WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings. ca. gov. Specifications: Type: Power Cords Box Dimensions: 3"H x 6"W x 6"L WT: 0. 71