Search for active fish from the boat is a task that cannot be solved qualitatively without modern electronics. Boatfishing echoer It turns chaotic wandering through a body of water into a focused study of the bottom and the water column. Modern sonar can show not only the depth, but also the structure of the bottom, the presence of a thermocline, and also distinguish between individual species of ichthyofauna by the density of the swim bladder.
The market is saturated with offers from budget Chinese models to professional complexes with side scanning, in this article we will analyze how to choose the optimal device, what radiation frequencies are important for different conditions, and make an objective ranking of popular models that have proven themselves in real-world conditions.
Choice navigational-search-complex It depends on a variety of factors, such as the type of boat, the way of fishing and the budget, but even a novice angler should understand the basic principles of sonar, so as not to overpay for unnecessary functions or, conversely, not to buy a useless toy.
Principles of operation and key specifications of sonar
The basis of any echo sounder is converter The quality of the image depends on the frequency of the radiation and the power of the transmitter. Low frequencies (for example, 50 kHz) penetrate deeper, but give a less detailed picture, while high frequencies (200 kHz and above) provide detail, but operate at lower depths.
Modern technologies such as CHIRP (Compressed High-Intensity Radar Pulse) allow scanning a wide range of frequencies at once, which allows for clearer target separation and minimizes noise. It is critical for the angler to understand the difference between a conventional 2D sonar and scanning systems.
Systems Down Imaging and Side Imaging They create a photographically accurate image of the bottom under the boat and on the sides of it, respectively, and this allows you to find sunken trees, driftwoods and clusters of fish that in normal 2D would look just like blurred spots.
⚠️ Attention: Installing the sensor on a transom requires strict adherence to the angle of inclination. Incorrect installation will lead to the appearance of "dead zones" and loss of signal at speed.
When choosing a model, pay attention to the resolution of the screen and the number of color gradations. The higher the resolution, the better you can see the boundary between the hard and soft bottoms. Radiation power It also plays a role: for deep-sea fishing on the rivers of Siberia, serious watts are needed, and modest values will be enough for catching perch in the shallow waters of reservoirs.
CHIRP technology versus conventional signal
A conventional sonar sends one frequency pulse at a time, creating "blind zones" between the pixels. CHIRP technology sends a continuous frequency-changing signal, allowing up to 15 times more data about the bottom, clearly separating fish and bottom structures, even when they are at the same depth.
Selection criteria: frequency, power and sensor type
When you decide on a model, you need to clearly articulate your tasks. If you want to troll at great depths, power and low-frequency range will be the priority. For spinning fishing in a trough or in shallow water, the detail and wide viewing angles provided by scanning technologies are more important.
The frequency band is the language in which the sonar communicates with water. Standard frequencies of 83/200 kHz are suitable for most tasks. However, having additional frequencies, such as 455 kHz or 800 kHz for scanning, dramatically changes the way search is done. High-frequency rays They allow you to see the fish in detail, distinguishing even individual individuals in the school.
The type of sensor also matters. transom sensors are versatile, but they create resistance when you're driving; sensors mounted on electric motors are easy to maneuver; metal boats or boats with a deep V often require cut-in sensors to avoid cavitation and disruption of the flow of water.
- 🔍 Cone angle: A wide cone (60-90 degrees) is good for searching, narrow (10-20 degrees) for a detailed study of the structure of the bottom.
- ⚡ Power: For depths up to 20 meters, 200-300 W is enough, for 50+ meters it is desirable from 500 W and above.
- 🌊 IPX7 protection: Be sure to check the class of moisture protection of the body, as splashes and rain are constant companions of fishing.
Don't chase the maximum screen size if you're fishing from a small PVC boat. The large display is good for mapping and viewing, but takes up a lot of space. For compact boats, diagonals of 5 to 7 inches with readable resolution are optimal.
Review of budget models: affordable electronics
The budget segment of the sonar market today offers surprisingly functional devices. Chinese brands such as Lowrance (Mark/Elite series), Garmin (Striker series) and Humminbird They've set a high standard for even low-cost models, and they're equipped with color screens and basic scanning functions.
For example, Garmin Striker 4 It's a popular hit because of its built-in GPS and easy control, it doesn't have mapping, but it's a great way to draw fish arcs and keep track of the waypoints, and for a beginner who just wants to find fish and not get lost, it's the perfect start.
Models labeled "DV" or "DI" in the title often indicate the presence of Down Vision (downview). In the budget class, this is usually a simplified version of the scan, but it allows you to distinguish between the hardness of the bottom and large objects. Screen resolution This class is usually 480x272 or 800x480 pickels, which is enough for diagonals of 4-5 inches.
⚠️ Attention: Cheap sonars often have a weak backlight or a flashing screen. Before buying, it is advisable to look at the device on in bright sunlight.
An important aspect of the budget segment is the configuration. Often the box already has everything you need to install, including mounts and cables. However, the length of the sensor cable can be limited to 5-6 meters, which in some boats will require the purchase of an extension cord.
Professional complexes: maximum detail
For those who treat fishing as a sport or lifestyle, there are professional fishing options available. sci-fiSeries devices Garmin GPSMAP, Lowrance HDS or Humminbird Helix/Solix These are powerful computers with high-resolution touch screens.
The main advantage of such systems is modularity and support for advanced scanning technologies, such as: LiveScope or Mega ImagingThey allow you to see the fish in real time, by tracking their response to the bait, and this changes the way they catch, so you can animate a wobler or a jig by watching the predator react on the screen.
Professional models support multiple sensors at once, and you can combine a traditional 2D sonar, side scanning, and 3D depth mapping. Multi-core processors ensure smooth operation of the interface even at maximum detail.
| Model | Diagonal | Technology | Power | GPS |
|---|---|---|---|---|
| Garmin GPSMAP 8616 | 16" | LiveScope, Ultra HD | 1,000 watts | Yes (cards) |
| Lowrance HDS 12 Live | 12" | ActiveTarget 2 | 500 watts | Yes (cards) |
| Humminbird Helix 10 | 10" | Mega Imaging+ | 500 watts | Yes (cards) |
| Raymarine Element 12 | 12" | Hypervision | 500 watts | Yes (cards) |
Integration with other onboard systems is another feature of the top models, which can control winches, show images from underwater cameras or broadcast data to the smartphones of crew members via Wi-Fi. Support for Navionics or C-MAP cards It allows you to build routes taking into account the depths and navigation signs.
Investing in a professional sonar is justified if you spend more than 20 days on the water in a season or participate in competitions where every minute of searching for fish matters.
Installation and configuration of equipment on the boat
The right installation is 90 percent of the success of a sonar, and even the most expensive instrument will show a porridge of noise if the sensor is not installed correctly, and the main enemy is cavitation, which occurs when the flow of water around the emitter is disrupted.
For PVC boats, the sensor is most often mounted on a transom with a removable bracket. It is important that the plane of the sensor is parallel to the surface of the water when the boat is in motion. For metal boats, a tie-in is preferable, but this requires sealing and accuracy.
So you start by choosing the language and the units, and then you calibrate the sonar to a specific body of water, and if you're fishing in shallow water, you turn on the "Shallow Water" mode, or manually set a depth range, like 0 to 10 meters, which will increase the speed of the screen refresh.