Best Sonar Fish Finder 2021 – Ultimate Guide and Reviews

Best Sonar Fish Finder

A fish is essential to any fishing trip, and you need one that will work for you. While there are a variety of fish finders available, you need to find the best sonar fish finder. A sonar fish finder works better than other fish finders, and you don’t need a degree in engineering to use one.

If you’re thinking about getting a fish finder, this review will give you a few options. After all, when you want to catch the biggest fish you can, you need a sonar fish finder to point you in the right direction.

Sonar Fish Finder Comparison Table


Product Name

Editor Rating


Raymarine Dragonfly-4 Pro Sonar/GPS

Raymarine Dragonfly-4 Pro Sonar/GPS

Lowrance Hook-7 Sonar/GPS

Lowrance Hook-7 Sonar/GPS

Humminbird Helix 9 Sonar GPS Fish Finder

Humminbird HELIX 9 Sonar GPS Fish Finder

Garmin Striker 4 Built-in GPS Fish Finder

Garmin Striker 4 Built-in GPS Fish Finder

How to Choose the Right Sonar Fish Finder


The power of the fish finder is described as “watts”. When a seller is describing a fish finder’s overall output power, they will often refer to it as “peak to peak performance”. When you’re looking for the best sonar fish finder, you want to make sure it is powerful enough to handle any depth you’re fishing.

If you’re not getting enough power to the display, you’ll have delayed action times, which won’t help when you’re trolling. Fish finders should be at least 800 watts, but you can find fish finders with wattage over 3000 watts. The environment you’re fishing in will determine which fish finder will be the best for you.


When you need clarity for your fish finder’s display, you need to make sure it has the right number of pixels. Since the display screen is made up of thousands of tiny pixels, the higher the pixel number, the images will be more clear.

If you’re looking for the best finder, you want to make sure the pixels are at least 240 x 160. You can move higher once you’ve become more comfortable using the fish finder. It can take some time to learn, but once you become comfortable with it, you can adjust the fish finder to your preference.


The transducer is what sends out the sonar signals into the water, which are sent back to the transducer. The transducer will take the readings, and send them to the display screen. Transducers can be difficult to place on a boat, especially if you’ve never attached one before. A transducer should be out of the waves of splash back from the motor, and the transducer should have a wide cone.

The wider cone allows more images to be picked up, which helps when you’re trying to find the fish. There are different degrees of transducers including: 9-60 degrees. The transducer also allows you to fish in deep or shallow water, as well.

Side Scanning

The fish finder should have a side scanning technology, and most of them have some sort of side scanning ability. The side scanning allows you to see objects directly to the side of the boat, which makes it easier to find fish.

The images from the side scanner are clear, and you can see everything around you. Even if you’re fishing in murky water, the side scanner will cut through the water to give you an excellent picture of everything in the water right next to your boat.


The display is the most crucial part of the fish finder, because if you can’t see what the transducer is picking up, you won’t have success. Most fish finders have colors, which makes it easy to determine what is a fish. While you can find some with a black and white feature, but you are better off with color.

When you’re looking for the right screen, you should consider the size of the display screen. The larger screens allow you to find fish a lot easier than using a smaller screen.

Recommended Best Sonar Fish Finder Reviews

1. Raymarine Dragonfly-4 Pro Sonar/GPS

Sharp Color

For finding the fish, you need a fish finder that has sharp color to let you see everything in your area. It produces wide viewing angles, allowing you to see more around you. It doesn’t create any internal fogging, making it practical for any fisherman


This fish finder comes equipped with plenty of US waterbodies. It includes lakes, rivers, and coastal maps to help you navigate your way around. The microSD slot lets you store your favorite positions into a safe place that won’t get lost when you’re not using the fish finder.

Dual Channels

The dual channels allow you to fish in deep or shallow water, which is practical for those wanting a change of scenery. The fish finder includes DownVision, that produces photo-like images. It includes a CHIRP sonar that targets the fish, wherever they’re hiding.

Live Sonar

For those that want to be interactive with their gadgets, this fish finder includes an app that allows you to live stream your sonar to your smartphone. You can rewind, save, and share your biggest catch straight to social media, making it a fun and interactive experience.


  • It includes a lot of features
  • The price is reasonable
  • Pictures are clear


  • The GPS is difficult to use

High Resolution

The display has high resolution colors that help you find fish and other objects in the water. The screen is 7 inches, making it practical for a fisherman out in the water. The colors are bright, vivid, and you can have multiple screens showing different things on the fish finder.


The CHIRP sonar includes a downscan imaging, allowing you to have a better view of what is under your boat.  When the sonar picks up a fish in your area the beeping sound will alert to the fish’s location. When you’re out in open water, you need accurate readings, and the CHIRP provides you with the best readings available.


The fish finder includes an internal GPS, allowing you to map out your routes quickly and easily. The map feature includes water maps of over 3000 US lakes, rivers, and coast lines to work just about anywhere.

Global Chart

For those that want to take their fishing trip around the world, you can circumnavigate the whole globe with this fish finder. You won’t get lost on open water when you’re using this fish finder for an exciting trip.


  • The screen is large
  • The transducer is large
  • Easy to set up


  • It has a slow response time

Large Screen

The fish finder has a 9-inch display screen that makes it easy to see everything in your area. It allows you to have multiple screens on at the same time, making it ideal for any fisherman to have accurate readings

Easy to Use

The fish finder is easy to use, thanks to the three programmable buttons.  For those that don’t want too many features this is an excellent choice. You can program your preferred settings to make fishing more fun.

Dual Beam

The dual beam sonar allows you to fish in different depths of water. Whether you’re fishing in shallow water, or decide to venture to deeper parts, you can use the fish finder to your advantage.

Versatile Mount

For those that want versatility with their fish finder, this unit includes a mount that lets you pick how you want to use it. You can install it on a gimbal or in-dash mount for your preference.


  • The display is clear
  • Easy to install
  • Easy to read in bright sunlight


  • May not work for everyone

Color Display

The color display is easy to use, and includes a screen that is 3.5-inches. It includes a high sensitive internal GPS to help you navigate through the water. For those that love seeing everything in the water, this fish finder brightens up when you have a hit.


The fish finder allows you to place markers in your favorite locations, so you can retrace your steps. This is an excellent feature that some fish finders don’t provide, which is astounding. You can use the markers to mark hot spots, docks, and ramps.


The keypad makes the fish easy to use, and is small enough to fit on schooners and other small boats. When you need to change the settings, you can scroll through the different menus to find what you need. For those serious about fishing, you need a fish that works for you.


Using a fish finder with CHIRP sonar is the best way to pick up fish. When it detects a fish, a notification will beep, allowing you to hone in on your target. Any serious fisherman knows how important the CHIRP sonar is to their success.


  • It is easy to install
  • Ideal for those on a budget
  • The design is excellent


  • The GPS is difficult to use


A sonar fish finder makes fishing more fun and more exciting, thanks to the different features. If you’re thinking about getting the best sonar fish finder for you, the Humminbird HELIX 9 Sonar GPS Fish Finder is an excellent choice. It has a large screen the color is crystal clear, and it is easy to use. While some of the other sonar fish finders do have more options available, they don’t have the clarity you need when you’re trying to reel in a large fish.

We like to share product recommendations with you and hope you like them! Just to make you aware FishingLab may collect a small share of sales or other compensation from the links on this page.


James Williams

I love to write for readers with a genuine interest in enjoying the fishing. Hence, I started this blog to provide you guides so that you can have a better and more pleasant fishing experience.

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