From AllPinouts
Connector pinout for: Lowrance AirMap, AirMap 300, GlobalMap 12, GlobalMap Sport

Pin connector as seen from back of unit
| 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
|
References

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