3. DIGITAL SELECTIVE CALLING
3-18
3.8 Position Request Call
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 FM-4721. FURUNO has taken
this feature one step further. If a compatible GPS chart plotter is connected to the FM-
4721, 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.
Note: The other vessel must have an operating GPS receiver connected to its DSC
radio and must not have its radio set to deny position requests. (Refer to section 3.5
to enter information into the individual directory).
3.8.1 How to set up a position request reply
The FM-4721 automatically (default setting) or manually transmits your position when
requested by 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 the MMSI or the name of the person making the request appears on the display,
allowing you to choose to transmit your position to the requesting vessel or not.
1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.
2. Rotate the CH knob to select [DSC Setup] menu then press the [SELECT] soft
key.
3. Select [Position Reply] with the CH knob then press
the [SELECT] soft key.
4. Select [Automatic] or [Manual] then press the [ENT]
soft key to save setting.[Automatic]: The radio auto-
matically transmits your vessel’s position to the re-
questing vessel. [Manual]: The display of the FM-4721 shows who is requesting
the position. Press the [YES] soft key to transmit your position to the requesting
vessel.
5. Press the [QUIT] soft key several times to return to radio operation.
3.8.2 How to set up the position request ringer
The position request ringer, which beeps when a position
request is received, can be turned off.
1. Press and hold down the CALL/MENU key until the
[Setup Menu] appears.
2. Rotate the CH knob to select [DSC Setup] menu then
press the [SELECT] soft key.
3. Select [DSC Beep] with the CH knob then press the
[SELECT] soft key.
4. Select [POS Request] with the CH knob then press the [ENT] soft key.
5. Select [Off] with the CH knob then press the [ENT] soft key to save the setting.
6. Press the [QUIT] soft key several times to return to radio operation.
To re-enable the ringer tone, Select [On] in step 5 of the procedure.
Note: When the [Position Reply] is set to [Automatic], the position request ringer does
not sound regardless of the setting in this procedure.
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