The Fish Finder And Its Working Procedure

Fishing is a great hobby and nowadays it is gaining popularity day by day especially to the young enthusiastic generation. It carries out several virtues like patience, attention and steadiness of a person. Not only entertaining, fishing is quite relaxing for the people who work under pressure all week long. A relaxing fishing tour under the shade or in a boat all day long, refreshes the body and mind simultaneously.

Previously, fishing required multiple qualities including the long and expert practice of seamanship. Nowadays fishing is not that much difficult to go for a successful fishing trip as fish finder is available now. If you have a renowned brand fish finder, you can easily find the appropriate place for fishing, all you have to know is its characteristics and using procedure. Here I will discuss about the features and using procedure as well as the basic working structure of a best fish finder.

Working Principle:

Fish finder works just like the same principle as radar, eco sounder etc. The sound propagates through the material. The propagation rate is different for different materials. The sound leaves the sender, reflects and return back to the receiver. From the sound atmosphere and the returning time is calculated and thus the fish finder detect the presence of fish in that area. The fish finder usually uses the ultra frequency sound in its operation.
The sonar send small sound wave around the water. When the sound wave got hit by any object like a fish, a part of it reflects back though the way it came. Another part of the energy, get absorbed by the object. When the reflected part travelled though the same way and reach the receiver, then it displayed on the screen. This wave shows the location and movement of the fish because the sound is returning in every millisecond with a report of new situation. If the fish is large enough, then the reflection become very big. Again this reflection shows the course and direction as well as the speed of the fish in the display.
You may wonder what if the fish is not in the right angle with the beam. Well, ion this case, the reflection gets diverted and the fish finder modifies the result accordingly. This is why the appearance of the fish on the display shows different colors. The ultrasonic sound energy, get absorbed by the object or the fish body, radiate the some portion which make this difference. This is called the secondary reflection or radiation. It shows the size and shape or the species of the fish.

Structure of The Fish Finder:

Fish Finder is generally installed on the board to work accordingly. It performs through its vertical probe. Let’s give you a bit more details about the fish finder.

Synchronized Block:

The electric sound pulse is creation and receiving procedure is synchronized in this region. This pulse spread throughout the surveillance area. When the ultrasonic pulse produces, the receiver part remain shut. As soon as the pulse sending secured, the synchronized receiver start receiving. The more precise this procedure, the greater report, amplitude and performance can be expected by the machine.

Pulse Generator Block:

The synchronized block control the pulse generation and receive procedure. With a fix amount of interval, this block creates some harmonic ultrasonic sound wave and impulse it in the atmosphere. The more high the frequency is, the more précised the result will be. If the receiver get any unstable result, the synchronized block will adjust the sender pulse accordingly so that we can get a clear concept about the underwater region and detect the presence of any marine life.


Transducer is a kind of adapter. It is used to transform the electrical energy in to a mechanical one while sending and the opposite while receiving the pulse from the atmosphere. Nowadays, the modern fish finders have additional probes operational to detect and measure the air speed and ship speed or the current speed and direction. It is usually installed under the keel (below the ships bottom), in the direct contact with water.


Amplifier or the amplification block is the part where the machine retrieve some selective signals from the detected object. The transmitted and reflective signal can demand highly jamming situation and the amplifier should be adequate enough to eradicate such situation and display the correct and précised result.
Directive Block:
Directive result is the part where the result of the probe is shown. Nowadays, the fish finder has different method to display the result of the underwater situation like paper tape, color or black-white display. Nowadays LCD display as well CRT display also used to view the result.
Well, I think you have learned enough about the basic structure and basic working principle of the fish finder.

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