Using Digital Selective Calling (Dsc) Features; What Is Dsc; Advanced Dsc Features - Uniden UM425 VHF DSC Owner's Manual

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Using Digital Selective Calling (DSC) Features

Digital Selective Calling or DSC is a standard that allows you to call other

stations using their unique identification code (the Maritime Mobile Service

Identity or MMSI number), just like you would call a phone number. To call

another station, just enter that station's MMSI number and choose the

voice channel you want to talk on. The radio uses channel 70 to transmit

your MMSI number to the other station along with the voice channel you

requested. If the other station accepts your call, both radios automatically

switch to the requested voice channel so you can talk to the other station.

DSC provides a system for automated distress calls. At the touch of a

button, the radio can transmit your MMSI number, the nature of your

distress, and your current position based on data from your GPS receiver.

The radio repeats the distress call every few minutes until it receives an

acknowledgement.

The DSC standard dedicates a VHF channel—channel 70—to digital

transmissions only. Since digital transmissions require less bandwidth voice

transmissions, channel 70 avoids the problems of busy voice channels.

The UM425 supports the following DSC features:

Feature

Individual Call

Group Call

All Ships Call

Position Request

Position Send

Test Call

Name and MMSI

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