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, the United States Coast Guard frequency for distress, safety, and calling.
•When you press any button (except PTT), a short tone sounds.
Turning On the Unit and Setting Squelch
1Before you turn On the unit, turn the squelch (SQ) knob fully counterclockwise.
2Then, turn On the unit by turning the Volume/Power (VOL) knob clockwise until you hear a hissing sound.
SPKR
MIC
SQ VOL
3Turn 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.
Strong Signals
Medium Signals 
Weak Signals 
Noise 
•To listen to a weak or distant station, turn the knob
counterclockwise. If reception is poor, turn it clockwise to cut out weak transmissions.
•If the squelch control is adjusted so that you continually hear a hissing sound, the unit will not scan properly.
4To turn Off the unit, turn the VOL knob counterclockwise until it clicks.
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