EXT ALM: Connect ship's alarm system.
DISP: Connect the monitor unit.
Blue Sign
COM1
COM2
DC
COM3
COM4
DC (+)
COM5
COM6
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
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.
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