Power On/Off:
1. Press the power button to turn on the sounder.
2. Press and hold the power button to turn off the sounder.
Adjust Display Brightness:
1. Press the "Brightness" button repeatedly to adjust the brightness level of the display.
Change Display Mode:
1. Press the "Mode" button to cycle through the different display modes, including bottom-lock, surface-lock, and split-screen modes.
Zoom In/Out:
1. Press the "+" button to zoom in on the display.
2. Press the "-" button to zoom out on the display.
Adjust Range:
1. Press the "Range" button to adjust the range of the sounder.
2. Use the "+" and "-" buttons to increase or decrease the range value.
Adjust Gain:
1. Press the "Gain" button to adjust the gain of the sounder.
2. Use the "+" and "-" buttons to increase or decrease the gain value.
Select Transducer Frequency:
1. Press the "Frequency" button to select the transducer frequency.
2. Use the "+" and "-" buttons to select the desired frequency.
Turn on/Off Fish Alarm:
1. Press the "Fish Alarm" button to turn on the fish alarm.
2. Press the button again to turn off the fish alarm.
Reset Zoom and Range:
1. Press and hold the "Range" button for a few seconds to reset the zoom and range settings to their default values.