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2. Move the ShuttlePoint knob to select DEPTH TREND, WIND SPEED TREND, TEMP
TREND or SOG TREND and press [ENT].
12.9
VHF DIGITAL SELECTIVE CALLING
Digital Selective Calling is a semi-automated method of establishing a VHF radio call. DSC
had also been designated as part of the Global Maritime Distress and Safety System
(GMDSS). This new system allows mariners to instantly send a Distress Call with GPS
position (when connected to the transceiver) to the US Coast Guard and other vessels
within range of the transmission. DSC will also allow mariners to initiate Position Request,
Position Report Calls to or from another vessel equipped with a DSC transceiver.
Compatible VHF Marine Radios with Digital Selective Calling are able to be interfaced with
the GPS Chart Plotter which feeds GPS data to the VHF and listens for DSC calls from the
VHF. By connecting a few wires between the compatible DSC VHF radios and the GPS
Chart Plotter it will receive:
1. A vessel that has transmitted a DSC Distress Call
2. A vessel that has transmitted a DSC Position Send Call
3. The position of a vessel that transmitted a DSC Position Request Call
12.9.0 Interfacing
To take advantage of these functions the GPS Chart Plotter must be interfaced (wired) to
a STANDARD HORIZON or compatible DSC VHF. For additional information refer to Par.
2.4 Connections.
CPF180i: Interfacing to VHF Radio
VHF Wires
CPF180i
Blue
Brown
Gray
Blue
Green
Green
Page 94
Figure 12.8a - NMEA Trend pages on CPF180i/CPF300i
Description
Brown wire (GPS chartplotter) outputs data to VHF
Gray wire (VHF) outputs DSC data to GPS chartplotter
Green is data common ground
Figure12.9.0 - Interfacing to VHF Radio for CPF180i
CPF180i and CPF300i
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