How to Use Fish Finder Sonar

How to Use Fish Finder Sonar
Fish finder sonar operates by using sound wave technology to perceive underwater objects. This device can provide you with valuable information to find fish easier. Fish finder devices display information such as the water surface line, depth, temperature, surface clutter, structure and fish symbols. Equipped with this device along with the knowledge about the game fish you intend to catch can significantly increase your fishing productivity.


Difficulty: Moderate

Things You’ll Need:
  • Fish finder
Step 1
Install and mount your fish finder sonar. Mount the device far from any turbulence and interference such as your boat's engine. Carefully follow the manual instructions for assembly to get the most accurate reading.
Step 2
Turn on the device and begin to adjust the settings depending on your fishing preferences and conditions.
Step 3
Set the light settings. Use the backlight feature if you are night fishing. Many fish finders have this feature.
Step 4
Adjust the sensitivity control. This feature controls how much detail you can see on the display. The higher the sensitivity level, the more sonar returns you will get including small baitfish and suspended debris in the water. Adjusting the sensitivity level too high might display items of little interest, while adjusting it too low might cause missed opportunities of fish sightings. Set this feature depending on conditions like water depth, water clarity and the type game fish you are pursuing.
Step 5
Adjust the zoom settings. This feature allows you to magnify the area close to the bottom of the water to reveal more fish and structure that might not be visible during normal operation. Most devices can be set to on, off, auto or manual ranges. This is especially useful when fishing for bottom feeders.
Step 6
Increase or decrease the chart speed to match the speed of your boat. Chart speed determines how fast or slow the sonar information moves across the display.
Step 7
Turn the fish alarm setting on or off. This depends if you are fishing for a specific type or size of fish. The alarm will sound when the device detects fish that corresponds to your setting. Fish alarm can alert you if it detects large fish only, medium fish only or all fish.

Tips & Warnings

Wipe the display immediately if it comes into contact with salt spray. Use a cloth dampened with fresh water to wipe affected surfaces.

Article Written By Rona Aquino

Rona Aquino began writing professionally in 2008. As an avid marathon runner and outdoor enthusiast, she writes on topics of running, fitness and outdoor recreation for various publications. Aquino holds a Bachelor of Arts in communications and English from the University of Maryland College Park.

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