Actisense PRO NMEA 0183 Buffer - 2 OPTO Inputs, 12 ISO-Drive Outputs, Serial Port, Ethernet Port, Pluggable Screw Terminal [PRO-BUF-2] Paddlesports | VHF - Handheld It also has reverse polarity

It also has reverse polarity protection to prevent damage due to incorrect wiring

This is the perfect sub

Fits many manufacturers of fishfinders

but without the NMEA 0183 output and multiplexer

Actisense PRO NMEA 0183 Buffer - 2 OPTO Inputs, 12 ISO-Drive Outputs, Serial Port, Ethernet Port, Pluggable Screw Terminal [PRO-BUF-2] Paddlesports | VHF - Handheld It also has reverse polarityPRO NMEA 0183 Buffer 2 OPTO Inputs, 12 ISO Drive Outputs, Serial Port, Ethernet Port, Pluggable Screw Terminal Two OPTO isolated inputs and twelve ISO Drive isolated outputs. Offering device protection and excellent flexibility, all in one product the Actisense PRO BUF 2, the intelligent, type approved PRO range buffer. The PRO BUF 2 is rugged, with a stainless steel housing, and provides isolation on all inputs and outputs. With two NMEA 0183 inputs,