Finding fish in an unfamiliar pond becomes a lottery if you rely only on luck and experience, ignoring modern technology. The presence of a motor on a boat creates specific conditions for the operation of electronics: constant vibration, the possibility of developing high speeds and the need for rapid orientation in a changing environment. motorboat It must have special specifications that distinguish it from stationary models for trolling or simple devices for quiet rowing.
Modern sonars can show not only the topography of the bottom, but also the structure of underwater vegetation, thermoclines and even individual schools of fish in real time. A properly selected device becomes the “eyes” of the captain, saving fuel and time, avoiding empty throwing tackles in fish-free zones. In this article, we will discuss key parameters that should not be ignored when buying.
Key parameters of sonar selection
The first thing to look at when buying is work-frequency For motor boats, which often travel long distances or operate at great depths, frequency range is critical. Low frequencies (about 50 kHz) provide greater depth of breakdown, but give a less detailed picture, while high ones (200 kHz and above) show the smallest details of the terrain, but at a lower depth.
The second important aspect is the transmitter power, measured in watts (RMS), which is the higher the ratio, the more confident the device will work on the move and under heavy chop, when the sensor can briefly detach from the water. Garmin and Lowrance They often lead the race in power, offering solutions for professionals, but for amateur fishing with an outboard motor, excess power is not always justified.
⚠️ Attention: Don’t chase for maximum power if you plan to fish mainly in shallow waters up to 10 meters. Excess signal will create many “dead zones” and noises, which will only make it difficult to read the echogram.
The size and resolution of the display also play a role, especially if the boat is used in daylight hours. In bright sun, a small screen can shine, making the picture unreadable. The optimal solution for a motorboat will be a diagonal of 5 to 7 inches with anti-reflective coating.
When choosing a sonar, pay attention to the presence of the CHIRP function - it significantly improves the separation of goals and allows you to see fish directly above the bottom, which is impossible on older single-frequency models.
Sensor types and fastening methods
The choice of how to install the sensor (transducer) depends on the design of your boat and the type of engine. transducerIt's a one-stop solution that allows you to quickly remove equipment after fishing.
If the boat is metal or has a plastic hull with the possibility of insertion, you can consider installing a sensor "through the side", this method eliminates the resistance of water and the risk of damage to the sensor on underwater obstacles, but requires drilling the hull and sealing, which is not always acceptable.
- 🚤 Tran mounting: universally, easily mounted, but creates resistance and the risk of hitting an obstacle.
- ⚓ Motor anchorage: Ideal for PVC boats, the sensor is placed on the foot of the motor, but requires accuracy when pulling the boat ashore.
- 🌊 Through installation: maximum reliability and no interference, but requires professional installation and drilling of the body.
We should also mention wireless sensors floats, which are thrown from the side, for active fishing from the engine, they are not suitable, since they are easy to lose when moving or get confused in the screw when maneuvering.
Functional capabilities for sea fishing
The modern sonar is not just a depth meter, but a complex navigation system. GPS receiver It's a practical tool that allows you not only to capture the coordinates of the catch points, but also to use the tracking function, returning on your way back.
Technology DownVision or DownScan It provides a detailed image of the bottom, almost like the one in the photo, which helps to distinguish between driftwood, rocks and vegetation.SideVision) the fisherman shall be able to view the sides up to 200 metres wide without moving.
⚠️ Attention: When using side scanning functions at high speed, the picture can be distorted or "teared"; For a clear image, it is recommended to reduce the speed of the boat to 5-7 km / h during the search.
The ability to download detailed maps of the reservoir relief allows you to plan the route in advance and avoid shallow waters, which is especially important when entering large water areas in fog or dusk.
Comparison of popular models for small craft
The market offers a variety of solutions, from low-end Chinese models to industry flagships, and to make it easier to choose, we compared several popular models that have proven themselves in the conditions of operation on motorboats.
| Model | Display. | Technology | GPS |
|---|---|---|---|
| Garmin Striker 4 | 3.5" coloured | CHIRP, ClearVü | Built-in |
| Lowrance Hook2-5 | 5" SolarMax | CHIRP, DownScan | Built-in |
| Humminbird Helix 5 | 5" colored | CHIRP, Side Imaging | Optionally. |
| Praktik 6M | monochrome | Single-frequency | No. |
Budgetary models such as PraktikThey're great at measuring depth and finding fish in statics, but they're not as detailed as they're moving. Lowrance and Garmin They provide much more information about the structure of the bottom, which is critical for trolling or finding eyebrows.
Why is a color display better than a monochrome display?
Color screens allow palettes to be used to distinguish different densities of the bottom and fish, for example, a hard rocky bottom will be displayed in red and soft silt in blue, which greatly simplifies the interpretation of data.
Proper installation and calibration of equipment
The success of the sonar is 80% dependent on the correct installation of the sensor, the sensor must be installed strictly horizontally relative to the surface of the water when the boat is in motion, if the nose of the boat during plane up, the angle of installation of the sensor must be adjusted.
The installation will require a drill, sealant, screws and possibly additional brackets, and it is important to ensure that all connections are tight, as moisture entering the connectors leads to corrosion of the contacts and loss of signal.
☑️ Checklist of sensor installation
After physical installation, you need to calibrate through the device menu, select the type of bottom language, sensitivity and depth range. Automated mode is suitable for start, but manual adjustment allows you to remove unnecessary noise and artifacts.
Typical errors in operation
Even the most expensive device will show useless porridge on the screen, if you make gross errors in operation. One of the most common problems is the wrong cable laying. The power wires from the battery and signal wires from the sensor can not be laid in one tourniquet or next to it, this creates tips and interference.
The second common mistake is to ignore the speed of the boat, and each sensor has a maximum speed limit, and exceeding that limit leads to cavitation, which causes the signal to be lost and the screen to burst.
⚠️ Attention: Never leave the sonar on if the boat is pulled out of the water for a long time. The radiator's operation "dry" even for a few seconds can cause the ceramic element of the sensor to overheat and fail.
While modern electronics are protected, extreme cold or direct sunlight, which heats the device to high temperatures, can shorten the life of the battery and display.
The quality of the image on the sonar depends on the purity of the surface of the sensor and the absence of air bubbles under it. Regularly check the sensor for algae and dirt.
Frequently Asked Questions (FAQ)
Can I use a fisherman in winter to fish from the ice?
Yes, most modern sonars have an "Ice Fishing" mode that changes the algorithms for static position, but it's important to keep the lithium-ion battery safe in the cold, as it loses charge quickly at low temperatures.
Does the material of the boat (PVC or metal) affect the sounder?
The boat material affects the way the sensor is attached, but not the signal quality of the sonar itself. The metal body may create more shielding interference for wireless signals (if any), but the wired sensor works equally well on any type of vessel.
How often should I change batteries or charge the battery?
The battery life depends on the battery capacity and brightness of the screen backlight. On average, one charge is enough for 6-10 hours of active operation. It is recommended to always have a superbank or a spare battery for multi-day trips.
Does the echo sounder show a particular kind of fish?
No, the sonar shows the density of the object and its size, it can't tell if it's a pike or a bass, and the experienced angler can tell the species of fish by the nature of the echo, the depth and the behavior of the jamb on the screen.