Lowrance electronic LMS-520C - Manual (Page 47)

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Com-1 wiring to receive NMEA position information
from some other GPS receiver.
Com-1 wiring to transmit NMEA position information
to another NMEA-compatible device.
Ground
To Other
Device
Com-1
To unit
Yellow (Transmit) NMEA Receive
Shield (Ground)
Orange (Receive) NMEA Transmit
Shield (Ground) Ground
Com-1
To unit
To Other
GPS Receiver