Standard Horizon CP180 - Manual (Page 68)

Page 70 CP180 / CP180i
FISH FINDER or a Digital Depth Sounder, Wind Speed/Direction, Speed Log with Temp
with NMEA output the GPS chart plotter is capable of show Trends in the data from the
device.
To select a NMEA Trend Page:
1. Press [MENU]. Move the ShuttlePoint knob to highlight NMEA DISPLAY and press
[ENT].
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). It is planned that DSC will eventually replace aural watches on distress
frequencies and will be used to announce routine and urgent maritime safety information
broadcasts.
This new system allow 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 Send
calls to or from another vessel equipped with a DSC transceiver.
STANDARD HORIZON 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 STANDARD HORIZON VHF 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.
Figure13.9.0 - Interfacing to VHF Radio
12.9.1 DSC Distress Call
During a Distress situation, a vessel that is equipped with a DSC VHF and connected to a
GPS, has the capability to transmit a DSC Distress Call with GPS Position.
When the STANDARD HORIZON VHF receives a DSC Distress Call, DSC/Position
information of the vessel in Distress is transferred to the GPS chart plotter. The GPS chart
plotter Logs the Distress call into the DSC DISTRESS LOG and also prompts the user to
see the location of the Vessel in Distress and also allows for easy navigation to the vessel.