Standard Horizon Marine Tranciever GX1280S Operating Instructions

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7.8  ADVANCED DSC CALLS
7.8.1  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.
7.8.1.1 Setup a Group Call
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
feature. The group MMSI is a 9 digit (first digit permanently set to “0”) that
will allow other radios to call your vessel along with others to automatically
switch to a working channel for voice communications. This function is very
useful for yacht clubs and vessels traveling together that want to collectively
make announcements on a predetermined channel.
1. Press and hold down the [
CALL/SET]
 key until
“RADIO SETUP” menu appears.
2. Turn the CHANNEL selector knob to select “DSC
SETUP” menu.
3. Press the [
CALL/SET]
 key, then select “GROUP
DIR” with the CHANNEL selector knob.
4. Press the [
CALL/SET]
 key, then select “ADD” with
the CHANNEL selector knob.
5. Press the [
CALL/SET]
 key.
6. Turn the CHANNEL selector knob to scroll through
the first letter of the name of the group you want to
reference in the directory.
7. Press the [
CALL/SET]
 key to store the first letter
in the name. Press the [
CALL/SET]
 key to move
the cursor one space to the right.
8. Repeat step 6 and 7 until the name is complete. The name can consist
of up to eleven characters, if you do not use all eleven characters press
the [
CALL/SET]
 key to move to the next space.
This method can also be used to enter a blank
space in the name. To clear the previous letter,
press the [
H/L]
 key.
9. After the eleventh letter or space has been entered, press the
[
CALL/SET]
 key to advance to the GROUP MMSI (Maritime Mobile Ser-
vice Identity Number) number entry. 
						

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10. Turn the CHANNEL selector knob to scroll through
numbers, 0-9.
11. To enter the desired number and move one space
to the right press the [
CALL/SET]
 key. Repeat pro-
cedure until all nine spaces of MMSI number are
entered.
12. If a mistake was made entering in the name or the
MMSI number repeat pressing the [
CALL/SET]
 key until the wrong char-
acter is selected, then move the CHANNEL selector knob to correct the
entry.
13. To store the data entered, press and hold the [
CALL/SET]
 key.
14. To enter another individual address, repeat steps 4 through 13.
15. To exit this menu and return to radio operation mode press the [
16/9]
key.
7.8.1.2 Transmitting a Group Call
1. Select the desired channel to use Group Call for
voice communications.
2. Press the [
CALL/SET]
 key. The “DSC OPERA-
TION” menu will appear.
3. Turn the CHANNEL selector knob to select
“GROUP.” (To cancel, select “EXIT” with the CHAN-
NEL selector knob or press [
16/9]
 key.)
4. Press the [
CALL/SET]
 key. The transceiver will
beep, and the “Group directory” will appear.
5. Turn the CHANNEL selector knob to select the
“Group” you want to contact.
6. Press the [
CALL/SET]
 key to transmit the Group
Call signal.
7. When the Group Call signal is sent, the dot-matrix
area of the LCD will be as shown in the illustration
at the right.
8. After the GROUP CALL is transmitted, all the ra-
dios in the group will switch to the designated chan-
nel.
9. Listen to the channel to make sure it is not busy,
then key the microphone and call the other ves-
sels you desire to communicate with. 
						

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7.8.1.3 Receiving a Group Call
1. When a group call is received, the MATRIX will produce a ringing alarm
sound.
2. The radio automatically switches to the requested channel.
3. Press any key to stop the alarm.
4. Monitor the channel for the person calling the Group for a message.
5. If you want to respond, monitor the channel to make sure it is clear, then
press the PTT on the mic and talk to the calling ship(s).
NOTE
After a Group call is received, the time the call was made and the ships
MMSI or vessels name will appear on the LCD.
7.8.2  Position Request
Advancements in DSC have made it possible to poll the location of another
vessel and show the position of that vessel on the display of the MATRIX.
Standard Horizon has taken this feature one step further, if any Standard
Horizon GPS is connected to the MATRIX, the polled position of the vessel
is shown on the display of the GPS chart plotter making it easy to navigate
to the location of the polled vessel. This is a great feature for anyone want-
ing to know the position of another vessel. For example you buddy that is
catching fish, or finding the location of a person you are cruising with.
NOTE
The other vessel must have an operating GPS receiver connected to its
DSC transceiver and must not have its transceiver set to deny position
requests.  (Refer the section 7.9 to enter information into the individual
directory). 
						

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7.8.2.1 Setting up Position Reply
The MATRIX can be set up to automatically or manually send your position
to another vessel. This selection is important if you are concerned about
someone polling the position of your vessel that you may not want to. In the
manual mode you will see the MMSI or persons name shown on the display
allowing you to choose to send your position to the requesting vessel.
1. Press and hold down the [
CALL/SET]
 key until
“RADIO SETUP” menu appear.
2. Turn the CHANNEL selector knob to select “DSC
SETUP” menu.
3. Press the [
CALL/SET]
 key, then select “POS RE-
PLY” with the CHANNEL selector knob.
4. Press the [
CALL/SET]
 key.
5. Turn the CHANNEL selector knob to select “AUTO”
or “MANUAL.” In “AUTO” mode, after a DSC POS
Request is received, the radio will automatically
transmit your vessels position. In “MANUAL” mode,
the display of the MATRIX will show who is re-
questing the position.
6. Press the [
CALL/SET]
 key to store the selected
setting.
7. To exit this menu and return to radio operation mode press the [
16/9]
 key.
7.8.2.2 Transmitting a Position Request to Another Vessel
NOTE
To transmit a Position Request, you must setup the MATRIX DSC Indi-
vidual / Position Call Directory with the name of the vessel(s) or person
and the MMSI of the DSC radio you wish to poll. To setup this directory
refer to section 12.1 Setting up the Individual / Position Call Directory
1. Press the [
CALL/SET]
 key. The “DSC OPERA-
TION” menu will appear in the display.
2. Turn the CHANNEL selector knob to select the
“POS REQUEST.”
3. Press [
CALL/SET]
 key to show the Position re-
quest directory. This directory uses the INDI-
VIDUAL Directory information.
4. Turn the CHANNEL selector knob to select a name. 
						

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5. Press the [
CALL/SET]
 key to transmit the posi-
tion request DSC call.
6. After a DSC position request is transmitted, the
transceiver remains on channel 70 until position
data is received from the polled vessel.
7. When the MATRIX receives the position from the
polled vessel it is shown on the radio display and
also transferred to the GPS Chart plotter.
8. If the MATRIX does not receive a reply, the LCD
will display “SEND” to prompt the user to send
the call again or exit the mode.
NOTE
If the MATRIX does not receive position data from the polled vessel, the
LCD will show “NO POSITION DATA.”
7.8.2.3 Receiving a Position Request
When a position request call is received from another vessel, a ringing alarm
will sound and POS REQUEST will be show in the LCD. Operation and
transceiver function differs depending on “POS REPLY” in the “DSC SETUP”
menu setting.
Automatically reply:
1. When a position request call is received, a calling alarm sounds 4 times.
Then requested position coordinates are transmit-
ted automatically to the vessel requesting your
vessels position.
2. To exit from position request display, press any
key.
Manually reply:
1. When a position request call is received from an-
other vessel, the LCD will be as shown in the illus-
tration at the right.
2. A ringing alarm sounds 4 times. Then select type
of reply function “REPLY” or “NO REPLY” by using
the CHANNEL selector knob.
3. The MATRIX display will show “REPLY” or “NO
REPLY” allowing you choose to send your vessels
location by using the CHANNEL selector knob. 
						

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4. When “REPLY” is selected, press the [
CALL/SET]
 key. And the your
position will be transmitted to the requesting vessel.
5. To exit from position request display, press any key.
7.8.3  Position Send
The feature is similar to Position Request, however instead of requesting a
position of another vessel this function allows you to send your position to
another vessel. Your vessel must have an operating GPS receiver connected
for the MATRIX to send the position.
NOTE
To transmit a Position Send Call, you must setup the MATRIX DSC
Individual / Position Call Directory with the name of the vessel(s) or
person and the MMSI of the DSC radio you wish to send your position
to. To setup this directory refer to section 7.7.1 Setting up the Individual
/ Position Call Directory.
7.8.3.1 Transmitting a DSC Position Send Call
1. Press the [
CALL/SET]
 key. The “DSC OPERA-
TION” menu will appear in the display.
2. Turn the CHANNEL selector knob to select the
“POS SEND.”
3. Press the [
CALL/SET]
 key to select the Individual
directory.
4. Turn the CHANNEL selector knob to select a name
in the directory.
5. Press the [
CALL/SET]
 key to send your position
to the selected vessel.
6. After your position is transmitted, the resend menu
will appear. To send your position again, select
“SEND” and press the [
CALL/SET]
 key.
7. To exit the mode, select “EXIT” and press the
[
CALL/SET]
 key. 
						

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7.8.3.2 Receiving a DSC Position Send Call
When another vessel transmits their vessels location to the MATRIX the
following will happen:
1. A ringing sound will be produced when the call is received.
2. Press the [
16/9]
 key to stop ringing
3. The position from the vessel sending it's position will be shown on the
display of the radio and also transferred to any Standard Horizon GPS
Chart plotter if connected. 
						

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8  RADIO SETUP
NOTE
The optional RAM+ MIC CMP25 can be also change the SETUP menu.
Refer to page 54 for details.
8.1  LAMP ADJUSTING
Allows setting up the backlight intensity or to turn it off.
1. Press and hold down the [
CALL/SET]
 key until
“RADIO SETUP” menu appears.
2. Press the [
CALL/SET]
 key, then select “LAMP” in
the “RADIO SETUP” menu with the CHANNEL se-
lector knob.
3. Press the [
CALL/SET]
 key.
4. Turn the CHANNEL selector knob to select the
desired level. When “OFF” is selected, the lamp
is extinguished.
5. Press the [
CALL/SET]
 key to store the selected
level.
6. To exit this menu and return to radio operation mode press the [
16/9]
key.
8.2  LCD CONTRAST
Due to varying mounting (overhead or below) this selection sets up the dis-
play for best viewabilty.
1. Press and hold down the [
CALL/SET]
 key until
“RADIO SETUP” menu appears.
2. Press the [
CALL/SET]
 key, then select “CON-
TRAST” in the “RADIO SETUP” menu with the
CHANNEL selector knob.
3. Press the [
CALL/SET]
 key.
4. Turn the CHANNEL selector knob to select the
desired level. The contrast level can be set from
“1” to “7.”
5. Press the the [
CALL/SET]
 key to store the selected
level.
6. To exit this menu and return to radio operation mode press the [
16/9]
key. 
						

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8.3  TIME OFFSET
Sets the time offset between local time and UTC (time GPS sends to radio).
Time is displayed when GPS position (LAT/LON) is displayed by pressing
the [
H/L]
 key.
1. Press and hold down the [
CALL/SET]
 key until
“RADIO SETUP” menu appears.
2. Press the [
CALL/SET]
 key, then select “TIME SET”
in the “RADIO SETUP” menu with the CHANNEL
selector knob.
3. Press the [
CALL/SET]
 key.
4. Turn the CHANNEL selector knob to select time
offset from UTC. See illustration below to find your
offset time from UTC. If “0:00” is assigned, the time
is the same as UTC (Universal Time Coordinated
or GMT Greenwich Mean Time).
5. Press the [
CALL/SET]
 key to store the time offset.
6. To exit this menu and return to radio operation mode press the [
16/9]
key.
OFFSET TIME TABLE 
						

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8.4  KEY BEEP (
ON/OFF)
This selection allows the beep tone when a key is pressed to be turned off.
1. Press and hold down the [
CALL/SET]
 key until
“RADIO SETUP” menu appears.
2. Press the [
CALL/SET]
 key, then select “KEY
BEEP” in the “RADIO SETUP” menu with the
CHANNEL selector knob.
3. Press the [
CALL/SET]
 key.
4. Turn the CHANNEL selector knob to select “ON”
or “OFF.”
5. Press the [
CALL/SET]
 key to set the key beep
condition.
6. To exit this menu and return to radio operation
mode press the [
16/9]
 key.
NOTE
Emergency alarm and beeps for DSC operation cannot be turned OFF.
8.5  WX ALERT (
ON/OFF)
This selection allows the radios NOAA Weather alert to be turned off. De-
fault setting is ON.
1. Press and hold down the [
CALL/SET]
 key until
“RADIO SETUP” menu appears.
2. Press the [
CALL/SET]
 key, then select “WX
ALERT” in the “RADIO SETUP” menu with the
CHANNEL selector knob.
3. Press the [
CALL/SET]
 key.
4. Turn the CHANNEL selector knob to select “ON”
or “OFF.”
5. Press the [
CALL/SET]
 key to store the selected
setting.
6. To exit this menu and return to radio operation
mode press the [
16/9]
 key.