Humminbird HELIX Series Operation Manual page 112

Adjust for Interference
If you are fishing near other ICE flashers or transducers, use CHIRP IR (Interference Rejection) to reduce interference or noise on
the sonar display.
Set the CHIRP Interference Rejection (CHIRP IR) using the X-Press Menu
1. Flasher X-Press Menu: With the Flasher View displayed on-screen, press the MENU key once.
2. Select CHIRP IR.
3. Press the RIGHT or LEFT Cursor keys to adjust the setting.
KEY SHORTCUT: With the Flasher View displayed on-screen, press the CHECK/INFO key to adjust the CHIRP IR setting (GPS models
only).
Set the Cone Angle
Use the following instructions to set the angle of the sonar beam. CHIRP IR must be turned off to set the Cone Angle.
1. Flasher X-Press Menu: With the Flasher View displayed on-screen, press the MENU key once.
2. Select Cone Angle.
3. Press the RIGHT or LEFT Cursor keys to adjust the setting.
15°
21°
15°-21°
Set the Upper/Lower Range
Upper Range and Lower Range control how much of the water column is displayed on the view. For example, if you are only
interested in the area between 20 and 50 feet deep, set the Upper Range to 20 and the Lower Range to 50. The view will not display
sonar returns outside of the set ranges, and greater detail for the selected range will be displayed.
1. Flasher X-Press Menu: With the Flasher View displayed on-screen, press the MENU key once.
2. Select Upper Range. Press the RIGHT or LEFT Cursor keys to adjust the setting.
3. Select Lower Range. Select Auto or set a specific depth (manual).
Auto: The Lower Range will be adjusted by the control head to follow the bottom automatically.
Manual : The control head locks onto the depth you select.
NOTE: There must be a difference of 10 feet between the upper and lower range settings.
Ice Fishing
(CHIRP models only)
(CHIRP models only)
Select 15° for a narrowly focused down beam.
Select 21° for a wide down beam and larger coverage area.
Select 15°-21° to use the full frequency range for your transducer.
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