Digital Selective Calling; I General - Icom IC-M59 Instruction Manual

4

DIGITAL SELECTIVE CALLING

I General

When an optional UX-120
tive calling (or DSC) can be used via the IC-M59. DSC is a
method of radio communications involving digital signals
rather than the more conventional method of voice commu-
nications. The advantage of using digital communications
over voice communications is that information (especially
useful for distress calls and other urgent matters) can be pre-
programmed into a radio and transmitted accurately.
DSC TYPE
Distress call
Distress relay call
All ships call
Individual call
Geographical area call
12
is installed, digital selec-
DSC UNIT
This sends distress information which includes your vessel's ID (and position data/UTC time
when a GPS receiver is connected). Send under emergency conditions only. DSC acknowl-
edgement will be received from a coast station after making a distress call.
This is used to alert Coast stations (or other ships) when a vessel in distress is unable to do
so. The IC-M59 can only receive this type of signal; not transmit.
This is used for non-emergency situations. This signal includes information which allows a re-
ceiving transceiver to automatically select a specified channel for voice communication.
This allows you to send a signal to a specific vessel only. The vessel's ID code must be pre-
programmed in advance. Two kinds of acknowledgements (able to comply/unable to comply)
are available (for sending or receiving) after an individual call.
This is used for announcement to all ships in the specified area—when a GPS receiver is
connected calls directed to areas other than yours are rejected. Receive only for the IC-M59.
In addition, when a GPS receiver (NMEA0183 ver. 1.5, 2.0 or
2.1) is connected, your vessel's position and the current UTC
time are transmitted together with the vessel's identity when
making a distress call.
See p. 27 for unit installation.
DESCRIPTION
UX-120 required
REF.
pgs.
13, 16
p. 16
pgs.
14, 16
pgs.
15, 17
p. 17