Lowrance AirMap, AirMap 300, GlobalMap 12, GlobalMap Sport connector

pinout

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6 pin LOWRANCE SPECIAL special connector  at the GPS

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

Source: Lowrance Website