Operation
•See Controls and Indicators (page 2) for button, knob, and key positions.
•When you turn On your ATLANTIS 250 just after purchasing, it is automatically tuned to channel 16 frequency for distress, safety, and calling.
•When you press any button (except PTT and LOCK key), a short tone sounds.
Turning On the Unit and Setting Squelch
Before you turn On the unit, turn the squelch (SQ) knob fully counterclockwise.
Then, turn On the unit by turning the Volume/ Power (VOL) knob clockwise until you 
hear a hissing sound.
SPKR
MIC
SQ 
VOL
Turn the SQ knob clockwise, just until the hissing sound stops. Use the knob to adjust to the desired squelch level. Think of the squelch control as a frequency gate which controls access to weak or strong signals depending on its setting.
•To listen to a weak or distant station, turn the knob counterclockwise. If reception is to cut out weak transmissions.
Strong Signals
Medium Signals 
Weak Signals 
Noise 
poor, turn it clockwise
•If the squelch control is adjusted so that you continually hear a hissing sound, the unit will not scan properly.
To turn Off the unit, turn the VOL knob counterclockwise until it clicks.
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