Choosing a first or new sonar is always a balance between wanting to see everything and not overpaying for unnecessary features. The market is saturated with models from budget "Chinese" to professional marine systems, and it is easy for a beginner to get confused in terms like CHIRP, DownScan or side scanning. A properly selected device can turn chaotic casts into sniper hunting, showing not just the bottom, but the structure of the bottom relief and individual schools of fish.
Before you open a store catalog, you need to clearly define the type of boat and the main method of fishing. technicalA mistake in the buying phase can cost you not only money, but also valuable time on the water, when the appliance either goes blind on the go or fails to show details important to fishing tactics.
In this article, we will look at the key parameters that affect image quality and help you understand which sonar is best for fishing from a boat in your case, and we will not just list the specifications, but explain how they work in real conditions: fast flow, in grassy bays or on deep sea brows.
Key parameters: frequency, power and resolution
The heart of any sonar is its emitter and the processor that processes the signal. work-frequencyLow frequencies (such as 50 kHz or 83 kHz) penetrate deeper but give a less clear picture, whereas high frequencies (200 kHz and above) show the smallest detail but operate at smaller depths.
Modern models use technology CHIRP The Comppressed High-Intensity Radar Pulse, which sends not one pulse, but a range of frequencies. This allows you to simultaneously see fish at different depths and clearly separate targets that would merge into one spot on a conventional sounder. The power of the emitter is also critical: for depths up to 10-15 meters, the standard 200-500 watts are enough, but hunting at depths above 30-40 meters will require a serious power reserve, otherwise the signal will simply not return to the bottom.
And don't forget the resolution. Even the most powerful sonar is useless if you can't see individual fish in the bottom of the garbage on a small, low-resolution display. Color screens with IPS matrixes provide excellent readability in the bright sun, which is critical for fishing from a boat.
When choosing a sonar, pay attention not only to the screen diagonal, but also to its resolution (pixel count). The 5-inch screen with a resolution of 800x480 will show much more detail than a 7-inch screen with a resolution of 480x272.
Types of scanning: classics vs. structural scanners
Traditional 2D sonar shows a cone-shaped slice of water just below the boat, a classic that's been tested for decades and is great for finding depth and active fish in the vertical plane, but it's often not enough to find fish sites, sunken trees or the exact bottom relief of a traditional cone.
This is where structural scanners come in, such as DownVision, DownScan or StructureScanThey use high-frequency lateral rays to create a virtually photographic image of the bottom under and on the sides of the boat, and this allows you to see not just a bump on the bottom, but a specific snag, a rocky mound, or the boundary of the grass where the predator is standing.
⚠️ Attention: Down/Side structural scanners are excellent at showing statics (bottom, snags), but often worse at seeing fish in the water column than classic CHIRP mode. The ideal strategy is to use two modes simultaneously on a split screen.
Side scanning (art.SideScan) extends the view to hundreds of meters away from the boat, an indispensable tool for exploring new water areas without having to walk every meter, you can swim along the shore and shoot through depths tens of meters from the side, finding promising points for subsequent catching.
Navigation and mapping: do you need a GPS module?
The modern sonar for the boat almost always comes in conjunction with the GPS-navigator, and this is not just marketing, but a real need.Waypoints) If you find any driftwood, pits or places, the stick allows you to return to them over and over again with the accuracy of a meter. Without GPS, you rely only on memory and landmarks on the shore, which in large water or in fog can lead to the loss of catchy space.
The important aspect is the support of maps. Built-in maps are often basic and do not contain detailed hydrography, the presence of a slot for memory cards and support for formats. Navionics, C-Map or Garmin BlueChart This opens up access to detailed navigation with isobates, which is especially important for safety in large bodies of water where you can easily run aground.
Function Auto-Guidance And while this is less common for fishing than for cruising, it's very valuable to be able to make a safe path along the fairway in an unfamiliar area, and the GPS track allows you to analyze the path you've traveled, which is useful for trolling for speed and area control.
☑️ Verification of navigation functions
Sensor design and method of installation on the boat
Selection of the method of installation of the sensor (transducer) Depending on your boat type and operating conditions, the most popular PVC kit is the one-size-fits-all kit with a clip on the transom, which is a simple and efficient solution to quickly remove the sensor after fishing, which is important for inflatable vessels, which are often stored assembled or transported in the trunk.
For aluminum and fiberglass boats with a permanent storage location on the water or trailer, cut-in sensors are often chosen, they are attached through the hull (through the hull) or glued inside, which eliminates overgrowth and damage during mooring. However, such an installation requires drilling of the hull and is not possible for some materials without loss of warranty.
The third option is a Trallinger mount or electric traction motor, which is ideal for trolling, because the sensor is always in a clean stream of water and does not create resistance.
| Type of installation | For what boats? | Pluses | Cons |
|---|---|---|---|
| Tranza (clip) | PVC, plastic, aluminum | Easy installation, removable | Interfering with pulling ashore |
| Indented (through the body) | Glass plastic, metal | No trouble, no bubbles. | Complicated installation, you can't remove |
| On the motor (Trollinger) | Electric motor boats | Perfect picture on the go | Only for electric-powered boats |
| Injunction (in case) | Boats, yachts | Aesthetics, protection | Requires professional installation |
Energy consumption and autonomy
Energy consumption is often overlooked when buying a powerful sonar for a small boat. Modern color displays with bright lights and powerful emitters consume significant current. If you use a 12V lead-acid battery with a capacity of 40-50 Ah (standard for starting a motor), an active sonar can discharge it in 6-8 hours of continuous operation.
For anglers who practice multi-day exits or use electric motors, standby and active current is critical. Lithium-ion (LiFePO4) batteries in this regard benefit from lead, as they keep the voltage more stable, and the voltage drop does not affect the electronics as much as in older batteries.
⚠️ Note: When connecting the sonar to the boat's onboard network, be sure to use a fuse corresponding to the current of the device consumption (usually 3-5 Amps). Direct connection without protection can lead to a fire when short circuit.
Also worth considering is the presence of an "Economic" mode, which reduces the frequency of screen refresh and radiation power when the boat is anchored or drifting, which allows you to significantly extend the operation time without recharging.
How to calculate the time of the sounder?
Take the battery capacity (Ah) and divide by the current of the sonar consumption (A). For example, the battery 50 Ah / 0.5 A = 100 hours. However, the real numbers are always lower due to the aging of the battery and temperature, so safely divide the result by 1.5.
Popular brands and models for different budgets
The sonar market is divided by several major players, each of which has its own technological features. Garmin It is famous for its screens and integration with autopilots. Lowrance and Siminrad (one group) is considered a reference for fishermen due to technology StructureScaneh Humminbird (a subsidiary of Johnson Outdoors) offers excellent side-scan solutions Side Imaging.
For the budget segment (up to 15-20 thousand rubles) models like Garmin Striker 4 or PractikThey're simple, reliable workhorses, without the bells and whistles that just show depth and fish, and they're perfect for beginners and small PVC boats.
In the middle segment (30-60 thousand rubles) the realm of technology begins, and you can already find models with GPS mapping and dual-frequency scanning, for example, in the middle segment. Lowrance Hook2 or Garmin EchomapThat's it. middle-of-the-road 90% of anglers, where the functionality already allows you to seriously engage in the search for fish, and the price is not yet biting.
Top segment (from 80 thousand rubles to infinity) is multimedia complexes with touch screens, support for radar, AIS and the ability to connect many additional sensors. Garmin GPSMAP or Simrad NSS They are often put on large boats, where not only the search for fish, but also navigational safety is important.
For fishing from an ordinary PVC boat or aluminum “Kazanka” is often enough model of the middle class with a diagonal of 5-7 inches and support for CHIRP.
Frequently Asked Questions (FAQ)
Will the sonar show the fish if it is standing in the grass?
A conventional sonar can show fish as part of a bottom echo, and it's difficult to disassemble them. However, high frequency and CHIRP models, as well as structural scanners (DownScan), can "pierce" the tops of the grass and show the fish standing in it or slightly higher.Sensitivity) and range (Range).
Do I need a side-scan echoer for the river?
For the river, side scan (SideScanIt's very useful for finding eyebrows, dumps and sunken trees without going over them. However, in strong currents and drifts, the picture can be distorted. For the initial stage, a bundle of classic 2D and DownScan (downview) is enough.
Can a sea sonar be used in fresh water?
Sound speeds in salt water and fresh water are slightly different, but modern sonars have a water type setting.Fresh/Salt) Switching the menu mode will give you the correct depth readings. Sea sonars are often more powerful, which can be a plus on deep lakes.
How often should the sonar be calibrated?
Modern digital sonars do not require regular user calibration, but when changing the battery, changing the sensor or switching from fresh water to salt (and back), it is recommended to reset the settings to the factory or perform automatic calibration through the menu. Installation or Setup.
Why does the sonar show the “dead zone” under the boat?
This is a physical feature of the cone beam, and in the center, right below the sensor, there's a zone where the side beams don't reach, and the center beam hasn't formed a cone, and in structural scanners, this problem is solved, they see the picture right below them, and in classical models, you have to swim over the object to show up on the screen a little bit later.