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Section 4 - DSC SETUP Menu
A valid USER MMSI must be entered into this radio before these DSC functions can be used.
4-1 What is DSC?
DSC (Digital Selective Calling) is a semi-automated method of establishing VHF, MF, and HF radio calls. It has
been designated as an international standard by the IMO (International Maritime Organization) and is part
of the GMDSS (Global Maritime Distress and Safety System).
Currently, you are required to monitor Distress Channel 16, but DSC will eventually replace listening watches
on distress frequencies and will be used to broadcast routine and urgent maritime safety information.
DSC enables you to send and receive calls from any vessel or coast station that is equipped with DSC func-
tionality, and within geographic range. Calls can be categorised as distress, urgency, safety, or routine, and
DSC selects a working channel automatically.
4-2 DSC SETUP Menu Options
Hold down CALL/MENU then scroll and select the DSC SETUP.
Press ENT or push the rotary knob to show the following DSC SETUP menu options.
Sections 1.3 and 1.4 explain how to navigate around the menu and enter, save and change data.
USER MMSI
GROUP SETUP
INDIV REPLY
ATIS MMSI
ATIS FUNC
DSC FUNC
LL REPLY
4-3 Check Your User MMSI (USER MMSI)
You can display and read your user MMSI at any time.
1.
Select DSC SETUP, then USER MMSI
2.
The LCD shows your user name and MMSI.
3.
If you have not already entered a User MMSI into your radio, see Appendix-E
4-4 Maintain Your Groups (GROUP SETUP)
Use GROUP SETUP to create, edit, or delete 1, 2, or 3 groups of frequently called people stored in alphanumeric
order. A group MMSI always starts with 0.
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See Appendix E - Enter Your USER MMSI (USER MMSI).
Check your user MMSI.
See section 4-3 . (If you do not have a user MMSI, see Appendix E.)
Enter or change the name and/or details of a group.
See section 4-4 .
Choose an automatic or manual response to calls. (721/725 US only)
See section 4-5 .
Enter or change your ATIS MMSI (721/725 EU only)
See section 4-6 .
Enable/disable the ATIS function (721/725 EU only)
See section 4-6 .
Turn the DSC operation ON/OFF (on/off ).
See section 4-7 .
Select the type of response to an LL polling request.
See section 4-8 .
Northstar Explorer VHF Series: 721/725 Operation and Installation Manual
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