Modern fishing with a swimming aid has long ceased to be a lottery, where the outcome depended solely on luck and experience of ancestors. sonar It's fundamentally changed the way we look for fish, turning chaotic flare into purposeful hunting, and many newcomers make the same mistake when they buy this gadget: they expect to see a clear image of fish on the screen, like in underwater documentaries, forgetting that the sounder only shows the reflected sound signal.
In fact, to effectively catch from a boat, you need to learn to “read” the screen, understanding the difference between thermocline, snags and accumulations of forage fish. Lowrance, Garmin or Humminbird Regardless of the brand, the basic principles of sonar technology remain the same for all devices, and the correct interpretation of data allows you not only to stand above the jamb, but also to understand whether the predator is active or passive, and which bait is better to offer at the moment.
In this article, we will explore how to turn your sonar from a simple “toy” into a powerful angler’s weapon that provides stable catches even in unfamiliar water bodies. We will touch on the technical aspects of installation, the subtleties of sensitivity adjustment and, most importantly, the tactical techniques of catching specific structures that are visible on the screen.
Principle of operation and choice of location of sensor installation
The foundation of successful fishing is the physics of sound wave propagation. The sounder emits a pulse that bounces off solid objects and comes back. The quality of the image depends on how well it's installed. sensor (transducer)If it's fixed curved or too high, you'll lose up to 40 percent of the useful signal, especially on the go.
The ideal position of the sensor is strictly horizontally relative to the surface of the water, so that the beam goes perpendicular to the bottom. When you install a PVC boat or aluminum "Kazanka" on a transom, it is critically important to avoid air bubbles hitting the working surface of the emitter. Bubbles create "dead zones" and noise, making the picture unreadable.
When installing the sensor on a transom, the upper edge of the emitter should be 3-5 mm below the bottom of the boat to minimize air capture while driving.
There are several ways of fastening, each of which has its own specifications:
- 🔹 Tran mounting: The most popular option, allowing you to quickly remove the sensor, but requiring careful adjustment of the angle of inclination.
- 🔹 In-tack sensor: It is installed at the bottom of the boat, provides a perfect picture at high speeds, but is difficult to install and maintain.
- 🔹 Throwable sensor: It is convenient for exploration from shore or inflatable boats without a hard transom, but is not suitable for trolling.
⚠️ Warning: Never turn on the sonar if the sensor is outside the water. Dry work even for a few seconds can irrevocably damage the radiator crystals due to overheating.
Basic setting of sonar parameters
Once in the water, don't rush to catch, and the first thing you need to do is adapt the factory settings to the current conditions: depth, transparency of the water and the type of bottom. Many anglers leave the Auto mode, relying on the device's algorithms, but manual adjustments often give a more detailed picture.
The key parameter is radiationFor most situations at depths of 20-30 meters, the optimal choice will be a high frequency (usually 200 kHz or 455/800 kHz in DownVision/SideVision systems). It gives a more detailed image of the structure of the bottom and individual fish. Low frequency (50 kHz) penetrates large depths and has a wide angle of view, but “smears” fine details.
What is a beam cone?
The angle of the cone determines the width of the view. At a depth of 10 meters, a narrow beam (20 degrees) "sees" a circle about 3.5 meters in diameter, while a wide beam (60 degrees) covers more than 11 meters. A wide beam is good for searching, a narrow beam for studying the structure in detail.
Also worth paying attention to is the speed of scrolling the screen: If the boat is moving slowly or anchored, the standard speed may be too high and you miss the short-term exit of the fish.Chart Speed) will allow the image to be stretched over time and to see details better.
The table below shows the recommended starting settings for different fishing conditions:
| Fishing condition | Frequency | Sensitivity | Depth range |
|---|---|---|---|
| Shallow water, grass | High (200+ kHz) | 60-70% | 0-10 m m m |
| Deep pit, swamp | Low (50 kHz) | 80-90% | Auto or 0-50m |
| Finding active fish | Medium/High | 75-85% | 0-20 m m m m m |
| Trolling at great depths | Low/Medium | 70-80% | Automobile |
Interpretation of the echogram: what we see on the screen
The hardest part for a beginner is translating visual images on the screen into understanding underwater reality. The sonar doesn't draw a fish, it draws an echo. Understanding what an object looks like comes with practice, but the basic patterns can be learned immediately.
The bottom is shown by the boldest and brightest line, and if you see a second, thinner parallel line underneath the bottom line, that's the line. secondaryIt occurs at high sensitivity and a hard bottom (stone, concrete) and confirms that the soil is dense. Soft muddy bottom "eats" the signal, and there will be no secondary echo.
The fish on the screen most often looks like an arc. Why an arc? When the boat goes over the fish, it first hits the edge of the beam (the signal is weak), then it hits the center (the signal is strong, the distance is minimal), and then it goes to the edge again. This process draws a characteristic arch.
- 🐟 Big arc: It indicates a large fish or a very active object that changes depth rapidly.
- ️ Little squirms: Most often it is a small forage fish (duckle, roach), which is kept in flocks.
- 🌫️ The cloud of points: It can mean plankton, thermocline, or a strong suspension in water that masks fish.
It's important to learn how to distinguish fish from algae, and algae usually hang from the bottom or swim in the water column, not having a clear arc shape, but rather being ripped, intermittent lines.
Tactics of searching for a predator: perch, pike, perch
Using a sonar to catch a predator requires understanding their behavior. The predator rarely swims randomly throughout the body of water; it's tied to the relief and accumulations of forage fish. The angler's job is to find these anomalies.
When searching puff We look for the first thing, the sharp drops in depth, the eyebrows, the dumps in the pits and the rocky placers, and the pile is often in the floes or at the bottom of the bottom, and if you see on the screen a sharp rise of the bottom (brow) and a accumulation of small things near the dump, the probability of finding a pike is 90%.
⚠️ Attention: When trolling or drifting, try to steer the boat strictly perpendicular to the brow, which will allow you to determine the upper and lower boundaries of the dump, where the predator most often stands.
Pike. It prefers to stand in ambush, in the midst of grass, driftwood, or bottom irregularities. On the echo sounder, grassy fields look like a fluffy layer above the bottom. Pike dots are often seen as small breaks in a solid line of grass or separate vertical columns extending from the bottom.
The ocean flocks on the screen look like dense clouds or carpets of many small dots and short arcs. Once you find such a cluster, it makes sense to stop and fish this square carefully, since the cauldron is often followed by the output of a large humpback.
☑️ Finding a perspective point
Crawling of peaceful fish: crucifix, bream, carp
White fish often stay in the water column, especially in hot weather or when there is a lack of oxygen at the ground, and the sounder allows you to see these horizons of the parking lot, which is critical for choosing the length of the leash when fishing on a feeder or floating from a boat.
Flocks of hazel often look like crisp, beautiful arcs hanging from the bottom at a distance of 10-50 cm. If you see that the arcs are strictly horizontal and at the same depth, the fish stands and feeds. If the arcs are smeared vertically, the fish is active and moves.
Carp and carp are characterized by paths at the bottom, which they knock out as they dig into the silt. On the screen, this can look like small clouds of suspension rising from the bottom.SideScan).
Using a sonar, you can control the feeding of bait, and if you drop the bait ball, you'll see a cloud of mud sink on the screen, and if 15 to 20 minutes later, there's dust from small things or individual arcs of large fish, that's the point.
Typical mistakes and expert advice
Even experienced anglers sometimes make mistakes with sonar that negate the benefits of the technology, one of the most common being excessive sensitivity, which leads to noise and false targets that fishermen mistake for fish while wasting time.
The main secret of success is not to search for fish constantly, but to find a structure (brow, hole, snag) and wait for the fish to come out on it, controlling the situation with a sonar.
Another mistake is ignoring the speed of the boat when searching. At high speeds (over 10-12 km/h for many budget models), the sensor does not have time to receive and process signals, the picture becomes torn. To study the bottom in detail, the speed must be minimal, allowing the screen to update smoothly.
And remember, the weather is very powerful, and the boat is swaying in the high wind and the wave, and the sensor is going to go deeper and then it's going to come out, and it's going to be a very chaotic surge in the bottom line on the screen. Smooth Depth If you have a sleeve, it is on your device’s menu.
FAQ: Frequently asked questions
Does the echo sounder show a particular kind of fish?
No, the sonar only shows the size, shape and density of the object. It can't determine the species composition. However, an experienced angler can assume the species of fish by the nature of the arcs, the depth of the parking lot and the bottom relief (for example, a pike on a rock, a pike in the grass).
Do you see a line and bait in the sonar?
Yes, if you set the sensitivity right and use the high-frequency mode, you can see a thin line coming off the sensor (the foam/cord) and the bait at the end, so you can control the wiring and see how the fish react to the game.
Do you need a fisherman to fish from the shore?
For classic shore fishing, a stationary sonar is of little use, because the view is limited, but there are throwable wireless sensors that allow you to study the relief and presence of fish at the point of throw from the shore.
Does the sonar interfere with other electronics on the boat?
If you put the wires right and you ground them, it's okay, and you can have problems if the sonar power wires are placed close to the GPS antenna or the radio, which causes tips.