rinker 280 ec with lowrance globalmap 5200c wiring question

trying to figure the wiring on my globalmap 5200c   3 cables come out of power plug  1 is to power the unit the other is to power nmea2000 now the last one i think its data for nmea1803 but what is it connect to in the boat i am unable to follow it .other plug says nmea and has a cable plugged in it .is it for the antenea? is it plugged in directly or is there a drop ? 


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