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EXT ALM: Connect ship's alarm system.
DISP: Connect the monitor unit.
COM4
COM2
COM3
COM1
DC (-)
DC (+)
COM6
COM5
Blue Sign
Internal ports of the Transponder
COM1: Long range communication device (Inmarsat C, etc.) or
External display (Radar, ECDIS, Pilotplug)
COM2 & COM3: External display, NAVNET 2, Pilot plug
COM4-COM6: GPS, Gyrocompass, Speedlog, ROT, etc.
Blue Sign: Connects a Blue Sign device, a lighting device mounted on the bridge
which gives off a blue light to warn oncoming vessels when your vessel is
navigating a channel in the reverse direction.
Note: A plastic sheet is placed across the cable glands of the transponder to keep
out foreign material. Cut out holes in the plastic where cables are to be lead in.