This is a dual purpose cable. It is utilized as a Power Cable Assembly for the FCV585 and FCV620 Fish Finders. In addition, this cable can be utilized as an NMEA0183 data cable for the GP33.
*Note: When used with the GP33, the fused portion of the red and black wire MUST be removed. In this application, this cable provides data only and CAN NOT be used to power the GP33.