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Connector pinout: Lowrance AirMap, AirMap 300, GlobalMap 12, GlobalMap Sport Lowrance AirMap, AirMap 300, GlobalMap 12, GlobalMap Sport pin name direction description color 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