26 VHF 7000, 7100US, 7100EU Operation Manual
Section 5 - Sending and Receiving DSC Calls
5-1 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 functionality, and within geographic range. Calls can be categorised as distress, urgency,
safety, or routine, and DSC selects a working channel automatically.
5-2 Sending DSC calls
1. Press CALL MENU to show the types of DSC call that can
Note that only four DSC call types can be shown at any
one time on the screen.
2. Press + or - to scroll up and down the DSC call types until
the cursor is positioned at the desired option. Then press
ENT. The DSC call types are:
These DSC facilities are available only on the VHF 7100US and
VHF 7100EU models, and a valid user MMSID must have been
entered to access the DSC functions.
Make a routine call or acknowledgement to a new caller or a
buddy. See Section 5-2-1, 5-2-2, and 5-2-3.
Make a call to one of your three groups.
See Section 5-2-5.
Show the details of the most recent incoming call.
See Section 5-2-4.
Make an All Ships call.
See Section 5-2-6.
Show the details of the 20 most recent incoming calls.
See Section 5-2-7.
Show the details of the 10 most recent distress calls.
See Section 5-2-8.
Request the LL position of a buddy.
See Section 5-2-9.