How To Use a Fish Finder?


Using a best fish finder is not a complicated task but requires some practice and training. Once you manage to learn to use it, you can locate more fish than those usually reach. This content points to help you get the basics of a fish finder so that you can enjoy another day of fishing.

Before we look at the best fish finders comparison, we would like to bring closer to the operation of the echo sounders, so that you can decide with this Test bench, which echoes sounder is right for you. In the end, we provide you than many Fish Finder before, with which you should increase safe ride and your fishing quota in the respective price category.

What is important when choosing a Sonar Best Fish Finder?

With a depth sounder or Fish Finder every angler pursues only one goal: find fish, Casting and catch fish. For the best fishing equipment is useless if the fish is not where you fish straight. The Fish Finder is to help the fishing quota and thus to increase the fun of fishing. The modern Fish Finders provide current even HD images from the nature of the waters reason, the temperature, the thermocline, the depth and whether the fish are at the surface, which means water or on the seabed. This interpretation of the images supplied by the depth sounder is to overcome the problem of most anglers. For a supply sounder not - explicit images from scanned fish, so no one knows for sure what it is because the water is exactly. What counts here is only experience, experience, experience.

Top Five Fish Finders 2018

1. Deeper Smart Portable Fish Finder 3.0

Deeper Smart Sonar iPhone iOS and Android Smatphone and Tablet Compatible

Deeper Smart Fish finder 3.0 can be launched at any point in the water. Floats on the surface of the water and transmits detailed information about the seabed and the water column - depth, bottom structure, temperature, vegetation, fish location and other valuable aspects of fishing directly to the screen of your smartphone or Tablet. Deeper Smart Fish finder 3.0 uses the Bluetooth connection to transfer the sonar data to your terminal. Fully portable and easy to connect, Deeper Smart Fish finder 3.0 can be used to fish from the shore, a dock, a bridge, a boat, a kayak or a duck.

Works in conjunction with smart phones and tablets (Both compatible - Apple iSO and Androids)

  • Smart, portable, wireless Connected via Bluetooth; Rechargeable battery
  • Fish places other Fishfinders can't reach: shore, bridges, embankments, dock, in rivers, kayak, float tube, radio controlled bait boats, ice fishing
  • Dual beam:290kHz(15Degree),90kHz(55Degree). Depth up to 130ft. battery up to 4 hours
  • Free application includes fish activity calendar, weather, diary, maps, sharing functions

2. Deeper Smart Sonar Pro

Deeper Smart Sonar PRO

Deeper Smart Sonar PRO uses the Wi-Fi connection to allow maximum distance between the Deeper device and the user. It is designed to float on the surface of the water and thoroughly scan the bottom and the water column - measure the depth, temperature, background structure, record the location of the fish - subsequently transmits all information instantly to your phone Smart the tablet. Deeper Smart Sonar PRO is a versatile sonar that is launched together with the line, perfect for fishing from the shore, a kayak or on the ice.

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3. Deeper Smart Sonar PRO +

Deeper Smart Sonar PRO+

Deeper Smart Sonar PRO uses the Wi-Fi connection to allow maximum distance between the Deeper device and the user. It is designed to float on the surface of the water and thoroughly scan the bottom and the water column - measure the depth, temperature, background structure, record the location of the fish - subsequently transmits all information instantly to your phone Smart the tablet. Deeper Smart Sonar PRO is a versatile sonar that is launched together with the line, perfect for fishing from the shore, a kayak or on the ice.

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4. Humminbird 409620-1 HELIX 5 DI Fish Finder

Humminbird 409620-1 HELIX 5 DI Fish Finder with Down-Imaging and GPS

           Precision Internal GPS Chartplotting with built-in UniMap cartography

  • Maximize your angling experience with the Humminbird HELIX 5 DI GPS fish finder GPS system
  • Micro SD card slot for optional maps or saving way points along with a gimbal mounting system

5. Venterior Portable Wired Fish Finder

Venterior Portable Wired Fish Finder

           Get the approximate location of fish and the depth as well as the Temperature of water

  • Detect and display short & tall weeds, and rocks on seabed
  • Round transducer sensor with 25 feet cable, 45-degree beam angle; Depth range from 1M to 100m.
  • With fish depth scale and audible fish alarm; Apply to the pond, river, sea and other fishing environment
  • Attention: 1. It will turn off itself if depth display reads "--" for 5 minutes for power saving. 2. The transmitter is waterproof, but the receiver (unit with screen) is not waterproof, so please do not put the receiver into water.

6. Garmin Echo 301dv Worldwide with Transducer

Garmin Echo 301dv Worldwide with Transducer

           Color Display

  • Includes: echo 301dv, 4-pin all-in-one 77/200 kHz HD-ID / DownVu transducer with transom mount and trolling motor mount, tilt/swivel quick-release mount, Power cable, documentation.
  • Display Resolution 480 x 640(VGA)
  • Color Display

7. Raymarine Dragonfly 6 Navionics+ Fish Finder

Raymarine Dragonfly 6 Navionics+ Fish Finder with CPT-60 Transducer

           Splay Type: LED backlit, sunlight-viewable, 5.7"diag, 640 x 480 Pixels

  • 50-channel internal GPS
  • Dual-channel sonar - wide-spectrum CHIRP Down Vision sonar for photo-like images and a second CHIRP conventional sonar channel for targeting fish
  • Simple to use; Power on and become a Dragonfly expert in minutes

8. Lowrance Hook-7 Fish Finder

Lowrance Hook-7 SonarGPS MidHighDownscan Navionics+ Fishfinder

            Lowrance-exclusive, brilliant, high-resolution, 7 inch , color display

  • CHIRP sonar plus downscan imaging combined to provide the best possible view beneath the boat
  • Highly accurate, built-in GPS antenna plus a detailed U.S. Map featuring more than 3,000 lakes & rivers & coastal contours to 1,000ft
  • Optional Americas chart upgrades include Lake insight & nautic insight Pro & HD, navionics hotmaps premium & fishing hotspots Pro
  • Global chart upgrade options include navionics + & jeppesen c-map max-n

9. Humminbird Helix 7 Chirp DI G2 Fishfinder

Humminbird Helix 7 Chirp DI G2 Fishfinder
  • 7-Inch Color WVGA Display with backlight
  • CHIRP Down Imaging
  • Dual Beam PLUS Sonar

10. Lucky Portable Fish Finder Fishfinder

Lucky Portable Fishing Sonar, Handheld Wired Fish Finder Fishfinder

            Detect and display grass, short & tall weeds, sand, and rocks on seabed

  • Get the approximate location of fish and the depth of water
  • Round : 4.6cm diameter Round transducer sensor
  • Range : Max: 100m (328.08ft) ; Min: 0.7m (2.30 ft)
  • With fish depth scale and audible fish alarm

Read The Manual

Perhaps the manual is not as attractive or have more technical information than you normally read, but it is essential to know how important it is to read it as it can become more familiar with the product you bought.

Install Your Fish Finder

The manual will guide you through the steps to properly install your model regardless of whether you use a transom mount, trolling motor mount, hull mount or portable assembly. If you have questions, you can consult a professional or ask an expert to install it for you.

Turn On Your Fish Finder

When you first switch it on, the unit is in automatic mode, i.e., use a pre - programmed setting. As you go familiar with the model, you can change it to manual mode and customize the configuration according to the fishing conditions you experience. To begin, let in automatic mode and walk for five minutes around the lake, bay or sea where you go fishing. Continually watching at the screen to get an idea of what you see. Do not even worry about catching fish or understand everything that shows the screen. That'll learn with experience.

Now start to set up a function at a time and get familiar with it. One of the main features you'll need to handle is the sensitivity setting. By setting this option, you are adjusting the power of the fish finder. The rule of thumb is the lower is the energy (sensitivity) lower the quality of vision on the screen. Sets the sensitivity to be between 75% and 100%. Trial and error is the best way to determine the optimal settings for your model.

The next setting you will see in manual mode is the Fish ID configuration. Once we know a little more unity, the Fish ID feature is off and get used to reading the fish arches that naturally see on the screen. Fish icons displayed by the Fish ID are useful for beginners, but when you start to become more familiar with what is shown on the screen, you will see that it is better to learn to read the arches of natural prey. The fish arches will give a more accurate of what is an underwater vision.

Another option that is best used with pre-programmed settings when you are a beginner is the Auto Depth function.

This feature, used with pre - programmed setting will tell the unit to trace the depths automatically and works best if you are new to the use of Sound. As you learn more, you can manually adjust the upper and deeper limits of the display glass. The tinier the image window you set, the better the resolution of this. In general, expert anglers eliminate a few meters of water from the top and stop scanning around 3m (ten feet) below the real bottom. The size of the display window varies depending on how deep the water is and the type of fish you want to catch. Try the window size you currently have until you're comfortable with the amount of water you can see and with the resolution of the image.

As you get more and more familiar you with your fish finder, you will notice a horizontal line across the screen. This line is the cursor depth and can move up or down on the screen. When you find some fish, adjust the depth cursor to suppress fish arches and then the unit will indicate what exact depth these fish are found. Now you know exactly how deep should drop the bait.

A final feature discussed in this article is the suppressor configuration. This function tells the unit how much noise "background" filter. It is helpful to reduce background noise, but if your transducer is installed correctly, it is not necessary. If it is a need to use the suppressor to locate fish, then you should verify that your sensor is installed properly. In general, it is better to have the suppressor off because if your setting is too high, it can completely block the sonar signal and thus cannot fish.

Can you imagine knowing where the fish are before launching cane and wait for a bite? As it is now possible, you can save the long hours of waiting, checking whether the rod moves and your prey has fallen on the hook and then end up changing area because where you have located or want to grow algae. Now, thanks to technology you can make sweeps of the area see if there is life under water before throwing the bait and wait for your reward. Thanks to the fish finder Deeper, we have in our possession a laptop and wireless sonar, supports more IOS and Android devices, we can use to find out where the fish are, depth and water temperature.

With the sonar Deeper, you can make shots high precision to reveal the place where the fish with incredible clarity and can throw the bait with confidence to conquer the dam. While the sensors incorporating detect water temperature and fluctuations of it, favoring knows the most suitable for the fish to bite. When thanks to the power of Deeper works perfectly in depths from half a meter to 40 meters below the water surface both sweet and salty, can see the structure of the seabed and the spaces they inhabit fish by Smart Imaging technology.

With a weight of just 100 grams and a diameter of 65 mm, Deeper is smaller than traditional sonar, so compact that you can carry in your tackle box fishing your fishing trips, whether on sea, river, boat, on the shore or pier. Stay connected to your sonar with Bluetooth technology to receive readings on your Smartphone or tablet up to distances of 45 meters in length, connecting only consumes battery and does not need to be covered by mobile data, so you can connect to the Internet while fishing for other tasks.

Receive final detailed images of the seabed, shoals, structures with very high accuracy on the sea conditions and the presence of fish, with Deeper you can comb a large area or focus on a particular point background. You 'll have full control over all uses and applications of sonar through the app Deeper mobile. Such as adjusting the sensitivity of the sonar to show more or less detail, change frequencies or more accurately extensive explorations, changing consumption devices power, suspend it or turn it on from the mobile IOS or Android, or to capture your conquests and share them on your social networks. Since the application is update able, always keep your sonar updated with the latest software do not lose functionality.

As simple as throwing the sonar with the Reed, explore the area, view the results from the mobile and if fish are present conditions are optimal and wait for the fish to bite. The Deeper is charged via USB, inside the sonar is the mini USB plug to charge both the computer and the car charger or the electrical current incorporating the package.

With a Deeper in your power, you can track where other sonar does not reach, getting to be a keen fisherman who astonishes your circle of friends with the catch.

What is a Fish Finder?

Among the equipment on board the probe prominently, especially in boats fishing enthusiasts place. The probe is an instrument to determine the depth to which the seabed is.

That has been its primary function for centuries until it began to apply the technology of sound waves when the probe went from being a rudimentary detection equipment to the fishing instrument.The first probes, now relegated to museums, were sinkers attached to strings that plunged to rock bottom, later to measure the wet out and set the depth.

In the early twentieth century the functionality of radio waves was discovered, a scientific milestone that provided small grains of sand eminent scientists as CA Doppler or A. Einstein.

Subsequently, they arrived paper probes, and more recently modern multi function displays.

How a Fish Finder Works?

You really cannot say that existing detection equipment fishing probes are at least being faithful to the real meaning of the word, so also called echo sounders. Since use sound waves to determine the background and the presence of fish under the boat.

Echo sounders are based on the principle of wave motion through a medium, in this case, water, and the Doppler effect.

To better understand how does a probe may be conducted a little experiment or to focus attention on daily aspects. We hear the echo in the valleys of large clumps of mountains or just in an elongated hall; it is a consequence of the operating principle of a probe. In both cases, a sound that receives more or less deteriorated after a while is issued. The same procedure carried out fishing echo sounders, emitting sound waves in the water and waiting for the answer.

The echo sequel is complemented by the Doppler effect, altering the visual spectrum waveform depending on the speed at which it moves away or about an object.

To understand this, you can put attention on the siren of an ambulance. When the ambulance comes, the sound becomes sharp (if the ambulance could run at the speed of light would look blue) and when he passed away and heard serious (visually translated by red).

The change in the speed at which a sound wave influences the distance between each of the radio waves, a physical characteristic probe fails to interpret the bottom fishing and fishing spot spreads.

The equipment emits a sound wave (pulse) through the transducer at a given frequency to the bottom, the depth setting under the time it takes the wave to reach the bottom, bouncing and back. This bouncing action is essential in the echo sounders since the original wave is altered each time it encounters an object, bouncing back and being picked up by the transducer.

Here comes a double effect. On the one hand measures the time the wave is "surfing" and other alteration of the wave (speed, intensity). The interpretation of these two data display on the screen allows not only the depth but the bottom contour, composition of the seabed and the fish found in the water column between the bottom and the boat.

To get this information echo sounder emit waves of frequencies determined by specific powers. Typically, the probes produce a single type of wave (frequency and electricity), although it is possible to have equipment able to emit two types of waves, which two representations are obtained, one of which is more suitable for interpreting background and the other optimized to detect fishing.

Fish Finder may be working on both frequencies and modify profits and other filters, to process the samples then and displayed the ideal image without having to be the unusual user settings.

Fish Finder displays the image according to the depth and type of bottom, so the user is unaware of the adjustments and can focus on fishing or sailing, knowing that you will always have the best background image on your screen. This process is called Clear Press and is exclusive to Raymarine.

Essential Characteristics of The Probes

In a best fish finder part not seen it is what generates and reads waves then interpreted on the screen. The teams have echo sounder transducers, elements capable of generating sound waves. One could say that they are speakers with ears.

These transducers can be modified to direct the beam of waves down, forward or sideways, setting useful options for fishermen. Each of these addresses can be applied a certain frequency since the frequency depends on the quality of information received.


The frequency of a stream is the amount of times the wave is generated per unit time. The rate is contained in hertz (Hz) in honor of its discoverer, Heinrich Hertz, and is determined as the amount of times per second are repeated alterations. Thus 200kHz probe emits two hundred thousand waves per second. But it is not how many waves are emitted, but the distance they are able to achieve.

The frequency is the inverse of wavelength. The more waves occur in a shorter second is the distance between them. And that frequency is inverse to the distance. A low-frequency wave reaches further than a high frequency. It is what happens in communications systems. An example: a VHF (ultra high frequency) radio has a range of 30 or 40 miles at most, while a shortwave station (standard in amateur radio) is able to send a message to the antipodes. This concept is applied to determine the operating frequency of the probe fishing under the bottom depth.

The high frequency (200 kHz) is indicated for shallow funds. It is a short wavelength, which allows many details, so it is also used in locating small fish shoals or small species that need precision for detection. Meanwhile, the low frequency (50 kHz) is suitable for deep bottoms and detect large fish.


The transducer probe has a dual function: to transform the electrical signal into a sound wave emitting and receiving the bounced wave, translate it into electrical pulses and send it to the processing unit. The frequency at which waves are emitted will define the type of transducer and its results.

Internally a sensor consists of crystals that vibrate when receiving a pulse; these glasses are designed to vibrate at 50 or 200 kHz, so when buying a transducer has to take into account some factors that help determine its quality. A very important factor is the number of crystals at 50kHz.

The more crystals, higher quality echo, and greater discrimination between echoes, even being able to distinguish a fish's seabed. The quickest way to know the quality of a transducer is to ask the "Q" factor. A minor factor "Q" higher quality sensor.

Another issue to consider is whether the transducer has diplexer or lack of it. Most current teams work with the diplexer.

The diplexer is only a device to receive the electrical pulse frequency shifts the signal to correct crystal transducer. Thus with a single transmitter and receiver on the echo sounder and less cable section thereof results than without diplexer, which is characterized by two wires for each transducer and two independent modules transmit and receive the echo sounder.

Single frequency transducers: can emit and receive a single frequency at a time, so must take into account the depth and the data needed to establish a high frequency or low.

Multifrequency transducers: more advanced than a single frequency equipment are the multifrequency equipment, equipped with two transducers or one with the double antenna. Is achieved with these have two interpretations simultaneously (for example, a low-frequency background and other fish at high frequency). To make better use of this information screens are larger, panoramic and color.

Another consideration of the transducers is their location on the boat, which defines its shape and installation mode.

The alternative to having the information forward are the transducers helmet. There are in version "hull", in which a hole that creates a weak point in the seal of the living work is done. The internal version is installed inside the hull, with the consequent loss of image quality by having to pass through the material of the hull.

The transducer stern is the easiest to assemble. It is placed on the transom, taking into account that is not affected by propulsion.

The installation does not require drilling into the hull, rather than fixing screws, but has the disadvantage of display images stern, no bow, so consider that when navigating through shallow water measurement background bow can be much less than indicated by the probe.

Another option is external transducers coupled by a fastener element to the hull. However, the best alternative when it comes to avoiding the consequences of pitch and roll in the transducers is to place the transmitter as close as possible to the bottom of the rudder post. Not forgetting the propeller sensors installed at the propeller hub and subjected to turbulence it generates.

Interior transducers have the same performance as thru-hull transducers without having to pierce the boat, an excellent solution to avoid holes while no quality is lost. These sensors must be installed in a zone where no boat hull nerves and no air bubbles are formed since, in this case, be lost performance.


​The power with which emits wave transducer influences the quality of reception. While it is true that power is associated with greater or lesser depth, the ability of the probe to reach deeper water does not depend on the power, but the frequency.

​However, power allows the frequency of the wave is stronger and spoil. To understand its operation you have to look at the sound waves. A powerful sound system can get the sound wave further, but because the frequency (the guide) is permitted. So are probed with powers from 500 to several thousand watts.

The power of fishing probes can be of two types: peak power or sufficient power (known as RMS). The active power is "effectively" the useful power. A probe may have a 3000 watts peak power, but only 400 watts of RMS. The power allows higher quality images, especially when the boat is moving and turbulent waters.

In professional and recreational particular quality probes usual powers of 600 W or 1 kW; 600 W for being shallow and deep water 1kW. In most computers that have integrated best fish finder this is 600 W (e.g., a97) and get 1kW must install an external module, such as a CP300.

Thus the scalar potential can multifunction and thus performance. If the probe is 1 kW and the transducer also, the performance will be maximized; if the probe is 600 W and 1 kW transducer, you never come to harness the full power; and if the probe is 1kW, but the transducer is 600W, it may be damaging the transducer, since the pulses will not support sends the probe.

Emission Angle

The probes provide information the water column in the vertical boat (vertical transducer), and must consider the distance from the sensor to the bow. The angle of emission depends on the information of the water column, which is not a column, but a cone (but can be flat), since each probe is designed to emit waves following a determined by the angle pattern.

It is also a point to keep in mind that lower viewing angle, greater discrimination, and more depth. The angle depends on the frequency. The higher the frequency lower corner, as happens with depth. Work more often provides more detail, but less space.


So far it has been referred to the less tangible part of the equipment: transducer, frequency, power but what identifies the probe is the screen. Today there are several types of screens, the evolution of television screens is also evident on the screens of probes giving the opportunity to have several types: CRT (cathode - ray tubes, now extinct), TFT or the more modern who came to replace: LCD screens. LED screens have made an appearance, and undoubtedly will continue to generate new technologies, so it is better not to waste time defining each type of screen, which makes obsolete the following technology.

From a sonar screen thing to consider are several fundamental aspects: size, resolution, and color.

The size is related to the resolution. As in the television screens are measured diagonally echo sounders and inches. You cannot set an optimal action, but consider that the higher, the larger is the information to display. The dichotomy is usually between a square screen or a panorama. In principle both are equally optimal, however, considering that the probes are increasingly able to display more information through a combination of equipment, it is best to go for a panoramic version, which also allows you to split the screen, a very useful option in multi - frequency probes.

The picture quality deserves special attention: it must be the greatest possible, and that depends on the resolution. Currently, the resolution is measured in pixels, the higher the number of pixels is increased image quality and more accurately the details shown. It is advisable for a real resolution is 640x480 pixels.

When buying the best fish finder, it is preferable to choose the color option since the color screens discriminate the type of fund; also considering having adequate luminance to display images, even when the sun strikes the screen.

Combined Teams

The less attention is points on the bridge, and more focused is the easiest information is access it and see what data are needed. In this sense the combined probes allow integrated into the computer screen information plotter, GPS, engine data, autopilot, AIS, NAVTEX ... and even the radar; reaching that allow manufacturers have superimposed information.

They are integrated all teams function as a network; so that as they are connecting network equipment it becomes larger. Have different screens and each shows a device and performs a function is an old practice.

Today is preferable to install multifunction displays that display the information of all equipment on board. Thus, reducing space, more details is achieved located. Should possess more than one screen, data displayed both networked devices as well, in the case of stop working one, there is the other, showing all information. On computers isolated this robust functionality is lost.

The good thing is that combined probes have plenty of information and the option to save fishing locations, create navigation defeats, and so on. More advanced are multifunction systems with integrated Wi-Fi, so you can access information from mobile devices and have many functions and applications updated at all times.

Choosing The Best Fish Finder

Throughout this tutorial, you have been aspects that must be taken into account when selecting the Best Fish Finder for each fisherman.

All these features should involve local needs, type of fishing and hobby fisherman, valuing the options market and trends publishing manufacturers, which each year have more advanced and higher performance probes. And one last tip: it is better to opt for a high-performance probe to discover that the chosen probe falls short and does not provide what is expected of her.