Choosing a first or additional sonar for fishing from a boat always involves finding a balance between price and functionality. The market is saturated with offers from Chinese manufacturers and well-known brands, which poses a challenge for the angler: how to find the real thing. low-cost sonarIt's a game that will show you a real picture of the underwater world, not just the noise on the screen. Many newcomers mistakenly believe that a cheap model is a toy, but modern technology has allowed you to significantly reduce the cost of basic devices without critical loss of quality.
In this article, we’ll look at the key parameters to save money, but not at the expense of fishing efficiency, why the frequency of the emitter is more important than the number of beams, how to properly mount the sensor on a transom, and whether you should overpay for a color display if you fish in moss. For fishing from a boat at depths of 10-15 meters, the critical parameter is not the power of the emitter, but the correct sensitivity setting and the speed of data update.
You need to decide on the type of boat and the way you fish, because it depends on the choice of mounting and the type of body of the device. If inflatable PVC boats are important compactness and the ability to quickly dismantle, for metal "Kazanka" priority becomes the protection from interference and reliability of the attachment. Let's look at the technical aspects of the choice.
Key specifications of budget models
When you look at the specifications of budget sonars, the first thing you look at is the number of beams. Marketers often extoll three-beam systems, claiming they give a big picture. low-cost sonar Having one quality beam at a 60 degree angle is often more effective than three 20 degree blur beams, one beam gives a clearer picture of the bottom and easier to interpret for a beginner.
The second important parameter is radiation frequency. Standard values are 83 kHz and 200 kHz. Low frequency (83 kHz) better penetrates the water column and shows the structure of the bottom at greater depths, but gives a less detailed picture. High frequency (200 kHz) is ideal for shallow water and detection of small fish. In the budget segment, there are often fixed frequency models, usually 200 kHz, which is quite enough for most water bodies.
Screen size also plays a role, but chasing a diagonal of 5-7 inches on a limited budget is not worth it. A small monochrome screen with a resolution of 240x160 pixels can even be better than a large color screen, since it is better read in bright sun and consumes less energy.
⚠️ Attention: Don't get caught up in the marketing ploys of "super-power" 600-1000 watts in cheap models. The actual effective power is often lower, and high power consumption will quickly land the boat's battery.
Types of sensors and methods of attachment to the boat
For fishing from a boat, the two most relevant types of sensor attachment are: transom and drop sensor. transom sensor is attached to the hard side or trawler with a special bracket. This is the most reliable option for permanent use. The sensor must be submerged in water and have direct contact with the water mass without air bubbles that distort the signal.
The drop sensor (called the float) connects to the head unit by wireless signal or cable, ideal for inflatable boats that don't have a hard transom or drill holes, but they have a downside: they can get entangled in the algae or stray off course in high winds, showing data not from under the boat, but nearby.
☑️ Verification of the sensor installation site
When installing a transom sensor, it is important to consider the material of the boat. On aluminum boats, the metal sensor can cause additional interference, so it is often recommended to install it through a wooden shelf or use plastic models. For PVC boats, it is important not to damage the cylinder and ensure that the cable passage area is leaky if you decide to make a stationary hole.
There are also sensors for in-hull installation, but for budget segments and temporary boats, they are rarely used, as they require sticking to the bottom. If you plan to upgrade in the future, choose a head unit with a standard connector so that you can easily replace the sensor with a more powerful one without replacing the entire device.
Overview of popular budget models
There are several market leaders in the affordable sonar segment that have established themselves among anglers. Practik The 6M or 7 series are considered the standard of reliability in the budget class, they are famous for their “unkillability”, excellent Russified interface and the ability to show fish even in difficult conditions.
Chinese brands such as Deeper (throwaway models) or JiabaidaThey offer interesting functionality for a little money, but you have to be prepared for the fact that the instructions can be translated by machine, and the plastic quality of the case is inferior to more expensive analogues, but they are great for amateur fishing.
Models from Lowrance Hook series Garmin The Striker series also have initial versions that can be found on the stock, and their advantage is in the ecosystem and the ability to update maps, but the basic functionality in the cheap versions can be reduced compared to the Chinese at the same price.
| Model | Type of sensor | Frequency | Features |
|---|---|---|---|
| Practik 7 | Body (thrown/trancing) | 72 kHz | High detail, frost resistance |
| Deeper Start | Throwable (Wi-Fi) | 290 kHz | Smartphone control, GPS |
| Lowrance Hook2-4 | Trants | 83/200 kHz | Automatic setting, color screen |
| Jiabaida 718 | Trants | 200 kHz | Ultra-low price, basic functionality |
Installation and initial setting of the device
The right installation is 90 percent of the success in getting a good picture, and once you physically attach the sensor, you have to get the cable right, and it doesn't have to be tensed, but it doesn't have to hang around, and you have to risk getting caught by the engine propeller, and you have to use plastic clamps or special clips to fix it.
The first turn on is better done at home, in a quiet environment, to understand the menu. Go to the language settings and select Russian. Then set the units of measurement (meters and degrees Celsius). It is important to immediately turn off automatic mode if you want to learn how to understand what is happening under water, although you can use auto mode to start with. Auto Sensitivity.
The secret to a clear picture
If the sounder shows a lot of “noise” (colored dots all over the screen), try to reduce sensitivity by 10-15% and increase the refresh rate (Scroll Speed).
When you go out, the first thing you do is calibrate the bottom, stand still, or move very slowly, if the bottom line is thick and blurry, reduce sensitivity, if the bottom is lost, increase the bottom, and get a thin, clear line of the bottom, while seeing the structure above it.
⚠️ Attention: Never turn on the sonar without a connected sensor submerged in water. Dry work can overheat and cause the emitting element to fail in just a few minutes.
Data interpretation: fish, relief and thermoclines
Learning to read a sonar is a skill that comes with experience. The fish on the screen is usually displayed as arcs. The shape and size of the arc depends on how the fish passed through the cone of the beam. The large arc is a large fish or fish that passed directly through the center of the beam. The small dots or short features at the bottom are most likely a trifle or a bottom fish (cat, perch).
The bottom relief is displayed by the bottom line. A solid bottom (stone, shell) gives a greasy, bright line with a "tail" at the bottom (secondary echo). A soft bottom (silt, grass) gives a thin, intermittent line. Understanding the structure of the bottom helps predict where a predator is standing. Sudak, for example, likes sharp eyebrows, and pike - overgrown areas.
Pay attention to the fish's "echo signature." The fat, saturated arc indicates a dense swim bladder, which is typical of active fish. Pale, blurred arcs can mean passive fish or small bladder species.
And you can also see a thermocline, which is a layer of water with a sharp temperature difference, and on the sounder, it looks like a horizontal band of noise or mist separating the top and bottom layers of water, and fish rarely enter this layer, preferring to stay above or below it, and knowing the depth of the thermocline helps to correctly expose the depth of the bait release.
Food and autonomy on fishing
Budget sonars often come with small batteries or require an external connection; a day fishing can also be used for a built-in battery if it is lithium; however, lead-acid batteries, which often come with cheap models, lose up to 50% of their capacity in the cold.
For a full fishing from a boat, the best solution is to buy a separate traction battery AGM or GEL with a capacity of 20 Ah. This will ensure the work of the sonar for 2-3 days of active fishing. Do not forget to purchase a waterproof battery box, especially if the boat is metal or fishing is in the rain.
The energy consumption depends on the brightness of the backlight. If you fish during the day, reduce the backlight to the minimum necessary for readability. This will significantly extend the life of the device. At night, the brightness should be reduced to 20-30%, so as not to blind yourself and scare the fish with glare from the screen.
Optimal power configuration for budget sonar: external battery 12V 20Ah + waterproof box + fuse in the gap of the plus wire.
Frequently Asked Questions (FAQ)
Will an inexpensive sonar show fish under the ice?
Yes, most low-cost sonars (especially single-beam ones) work well on ice, so you have to put the sensor in the hole, so you don't have to touch the edges of the hole and you have to immerse yourself in water, and in winter, you have to adjust the sensitivity settings, because the structure of ice and water is different from the summer one.
Can I use a sonar without a battery, connecting to the on-board network of the car?
Theoretically, it can, but it's not recommended. The car's onboard network has power surges and interference from the generator, which can burn the sonar electronics. Use only a stabilized power source or a separate battery.
Why does the sonar show the fish and the cool one doesn't?
The sounder shows the presence of an object that looks like a fish in density and size. It may be a fish, but it may be passive. It may also be driftwood, grass, or gas bubbles. The experience comes from being able to match the picture on the screen with the actual bites.
Is the sonar bad for fish?
The radiation of domestic sonars is negligible and absolutely safe for fish and other aquatic life, and the frequencies at which they operate do not adversely affect the senses of fish.