Turning the Radio On or Off
 
1. Rotate the 
 
On/Off/Volume Control
 
 knob clockwise. You will hear the self-test 
pass tone and see the green LED indicator light momentarily.
2. Rotate the
 
 On/Off/Volume Control
 
 knob counterclockwise until you hear a 
click and both the display and the LED indicators turn off.
 
Adjusting the Volume
 
1. Turn the On/Off/Volume Control knob clockwise to increase the volume, or 
counterclockwise to decrease the volume.
 
Selecting a Radio Channel
 
1. Press the 
 
 
 
or   button to select the desired channel.
 
Sending a Call
 
1. Turn radio on and select appropriate channel.
2. Press 
 
PTT
 
 button, hold the microphone 1 to 2 inches (2.5 to 5 cm) from your 
mouth, and speak clearly into it.
3. Release 
 
PTT 
 
button to listen.
 
Receiving a Call
 
1. Turn radio on and adjust volume to the desired level.
2. Select desired channel.
3. To respond to an incoming call, press 
 
PTT
 
 button, hold the microphone 1 to 2 
inches (2.5 to 5 cm) from your mouth, and speak clearly into it.
 
Starting or Stopping Scan
 
1. Press the preprogrammed 
 
Scan
 
 button to start scan. The green LED indictor 
blinks during scan operation. Or, select a channel that has been prepro-
grammed to start Auto Scan.
2. Press the 
 
Scan
 
 button again to stop scan. Or, select a channel that has not 
been preprogrammed to stop Auto Scan.
 
Deleting a Nuisance Channel During Scanning
 
1. While radio is on a nuisance channel, hold down preprogrammed 
 
Nuisance 
Delete
 
 button until you hear a tone.
2. Release 
 
Nuisance Delete
 
 button.
 
GM3188 Quick Reference Card
 
Record the functions for your radio’s programmable buttons in the table 
provided below. For further information, see page 8 of this User Guide.
Programmable
Button 2 (P2)
Red/Yellow/Green
LED Indicators
Programmable
Button 1 (P1)
Microphone
Jack
Knob
On/Off/Volume
7-Segment
Display
Channel Selector
Buttons
High Power
Indicator
 
Button Function Short Press  Long Press
Hold Down Page
 
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