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31Northstar Explorer VHF Series: 721US, 721EU Operation and Installation Manual
5-3 Call an Individual (INDIVIDUAL)
You can call anyone who has a radio with DSC functionality. You can set the priority level of the DSC call to
routine, safety, urgency, or distress. Choose:
• ROUTINE to make a routine call
• SAFETY to send safety information
• URGENCY only when there’s a serious situation or problem that could lead to a distress situation
• DISTRESS only when there’s a distress situation.
1. Press CALL/MENU to enter the DSC CALL menu, then select INDIVIDUAL to call another person.
2. The cursor is at ROUTINE. Press ENT or press the rotary knob to make a routine call or select to another
priority level.
3. The cursor is at MANUAL NEW. Press ENT or press the rotary knob to call a person who’s not in your
buddy list; otherwise select the name of your buddy.
If you selected MANUAL NEW, enter the user MMSID and then press ENT or push the rotary knob.
4. Select the working channel and press ENT or press the rotary knob. (NOTE: If you’re making a distress
call, the radio goes to CH16 automatically.) Duplex channels can’t usually be called and are automatically
eliminated from the suggested call list. If the call is to a Coast Station, the radio will recognize this and
select the correct channel.
5. The radio summarizes the call details and asks for confi rmation to send the call (SEND?). Press ENT or
push the rotary knob to send the call. The TX annunciator is displayed on the screen while the DSC call
is being sent.
6. If the call is acknowledged (ACK), press PTT to talk. If there’s no reply to a routine call, try again (see
Section 5-3-1).
5-3-1 Retry a Routine Call
1. If there’s no reply to your call after one minute (UNABLE TO ACKNOWLEDGE)
the radio asks if you want to retry the call (SEND AGAIN?).
2. Select YES and press ENT or push the rotary knob to retry the call. If the call
still can’t be placed, the radio returns to normal operation.
5-3-2 Acknowledge an Individual Incoming Call
The Explorer 721EU requires the operator to manually send an acknowledgement
to the requesting radio. Press ENT or push the rotary knob to send an acknowledge-
ment or press ESC to cancel.
The Explorer 721US automatically sends an acknowledgement to the requesting
radio within 10 seconds of receiving the call.
INDIVIDUAL
> ROUTINE
SAFETY
URGENCY
ROUTINE
> MANUAL NEW
BUDDY1
BUDDY2
012345678
INDIVIDUAL
ROUTINE
> SET CHANNEL
MANUAL MMSID
0––––––––
012345678
INDIVIDUAL
ROUTINE
> SEND?
12345678
INDIVIDUAL
ROUTINE
CALLING...
INDIV ACK
012345678
PRESS PTT
ESC –> EXIT
012345678
INDIVIDUAL
ROUTINE
WAITING ACK
VHF721
SEND AGAIN?
> YES
CANCEL
RCV: INDIV
012345678
ENTER –> ACK
ESC –> EXIT