Lowrance AirMap 100, GlobalMap 100, GlobalNav 12, GlobalNav 200, GlobalNav 212 connector

pinout

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6 pin LOWRANCE SPECIAL (round) special connector  at the GPS

Pin Name Description 1 VCC Power 2 RX RS-232 (receive serial) 3 GND Ground 4 TX NMEA/Pseudo RS-232 (transmit serial) 5 - DO NOT USE (recharging purposes) 6 - DO NOT USE (recharging purposes)

Source: Lowrance Website