DIGITAL SELECTIVE CALLING
4
12
■
General
When an optional UX-120
DSC UNIT
with RC-18
DISTRESS
SWITCH BOX
is installed, digital selective calling (DSC class-F)
is available with via the IC-M59
EURO
.
DSC is a method of radio communications involving digital
signals rather than the more conventional method of voice
communications. The advantage of using digital communica-
tions over voice communications is that information (espe-
UX-120 required
cially useful for distress calls and other urgent matters) can
be pre-programmed into a radio and transmitted accurately.
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 pgs. 23, 24 for unit installation.
DSC TYPE
DESCRIPTION
REF.
Distress call
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.
pgs.
13, 16
Distress relay call
This is used to alert Coast stations (or other ships) when a vessel in distress is unable to do so.
The IC-M59
EURO
can only receive this type of signal; not transmit.
p. 16
All ships call
This signal includes a category and channel data which allows a receiving transceiver to au-
tomatically select channel 16 for voice communication.
pgs.
14, 16
Individual call
This is used for calling to a specific vessel. The IC-M59
EURO
has no individual call transmis-
sion capability, but has receive capability. Two kinds of acknowledgements (able to comply/un-
able to comply) are available after receiving an individual call.
pgs.
15, 17
Geographical area call
This is used for announcement to all ships in the specified area—when a GPS receiver is con-
nected calls directed to areas other than yours are rejected. Receive only for the IC-M59
EURO
.
p. 17
