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9.7
GROUP CALL
This feature allows the user to contact a group of specific vessels (example
members of a yacht club) using DSC radios with Group call function to auto-
matically switch to a desired channel for voice communications. This function
is very useful for yacht clubs and vessels traveling together that want to collec-
tively make announcements on a predetermined channel. Up to 32 Group
MMSI may be programmed.
9.7.1 Group Call Setup
For this function to operate, the same Group MMSI must be programmed into
all the DSC VHF radios within the group of vessels that will be using this fea-
ture. To understand Group MMSI programming, first a Ship MMSI has to be
understood.
Ship MMSI: The first three digits called a MID (Mobile Identity Group) of a Ship
MMSI denote the country the ship registered for a MMSI. The last 6 digits are
specific to the Ships ID.
Ship MMSI Example: If your MMSI is "366123456", "366" is MID which denote
the country and "123456" is your ships MMSI.
Group MMSI:
Group MMSI numbers are not assigned by the FCC or other organizations
licensed to assign ship MMSI numbers.
The first digit of a Group MMSI is always set to "0" by International rules.
All Standard Horizon radios are preset so when programming a Group
MMSI the first digit is set to "0".
The USCG recommends programming the MID of a ships MMSI into the
Second, Third and Fourth digits of the Group MMSI as it denotes the area
the ship is located in.
The last 5 digits are decided upon by persons in the Group. This is an
important step as all radios in the Group must contain the same Group
MMSI so they can be contacted by each other. There is a chance that
another group of vessels may program in the same Group MMSI. If this
happens, simply change one or more of the last 5 digits of the Group MMSI.
1. Press and hold down the
appears.
2. Press the
menu.
3. Press the
RECTORY" with the
4. Press the
the
/
GX1600
key until "Setup Menu"
/
key to select "DSC SETUP"
soft key, then select "GROUP DI-
/
key.
soft key, then select "ADD" with
key.
Page 51
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