Digital selective calling (dsc) – Raymarine Ray54 User Manual
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Ray54 VHF Radio
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10 Weather Channel watch with 1050Hz Alert Tone detect
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Dedicated key for switching to Priority Channel 16
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Programmable Secondary Priority Channel key
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All Scan, Memory Scan and 2 Priority Scan functions
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Dual/Tri Watch Monitor modes
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Editable Channel Name displays a 12 character designator
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Enhanced GPS Position Data gives Latitude and Longitude to 1/10,000
of a minute plus Time, SOG and COG data from any NMEA input
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Automatically distinguishes between calls made to Ship or Coast Stations
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Low and High Voltage detection with alarm
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User Mode provides easy access to favorite channels
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Local Mode decreases noise in areas where RF interference is high
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Key Beep volume adjustment (3 levels)
Digital Selective Calling (DSC)
The Ray54 includes equipment for Class “D” Digital Selective Calling
(DSC). DSC protocol is a globally applied system used to send and receive
digital calls. DSC uses a unique Maritime Mobile Service Identity (MMSI)
number to direct DSC calls directly to your radio, much like a telephone
number.When the DSC signal is received, the radio quickly switches over to
channel 70 and performs the corresponding operation.
Note: An MMSI number is required to operate the DSC equipment in this ra-
dio. You can program the MMSI number yourself one time only using the
Menu Operation described in this handbook. See My MMSI ID on page 72.
The Ray54 includes the following DSC features:
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Separate receiver dedicated to handling DSC Calls on channel 70
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Position Request function sends GPS position data to or receives position
data from other stations
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Phonebook for automatically making DSC calls
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Quick Save feature saves incoming DSC Calls and the caller’s associated
MMSI number directly into the phonebook
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Quick Call feature sends Individual Calls or Group Calls directly from
the phonebook, just like the redial function on a telephone
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Three (3) Group IDs for making DSC Calls only to stations in your group,
such as a flotilla or fishing fleet
DSC functions are fully described in Chapter 5.