This dual-purpose cable is utilized as a power cable assembly for the FCV585 and FCV620 fishfinders. Cable can also be utilized as an NMEA 0183 data cable for the GP33 GPS receiver. 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 unit. Can be used as NMEA 0183 cable for GP33 receiver | Power/Data Cable For FCV585/FCV620 Fishfinders in Red