How to choose a sonar for a PVC motorized boat

Buying the first motor boat opens up new horizons for the fisherman, but without the right equipment, catches can remain at the level of shore fishing. The sonar is not just a toy for the rich, but a navigation device that allows you to understand the bottom relief and see fish, which is critical when fishing from a boat. Unlike stationary boats, polyvinyl chloride boats have their own specifications of operation, which dictate strict requirements for the choice of electronics.

The main difficulty is that PVC is flexible, and the motor creates constant vibration and shock loads during the course of the wave. Incorrectly selected device The market is full of models ranging from budget "Chinese" to professional systems, and it is easy for a beginner to get confused about the specifications.

In this article, we will discuss what parameters to look for to buy a device that will last for many years, you will learn why the scanning frequency is more important than the number of colors on the screen and how to properly fix the sensor so as not to damage the balloon. Competent choice It will save you money and nerves by allowing you to focus on the fishing process.

Features of the operation of the sonar on a PVC boat

The main difference between an inflatable side and a rigid aluminum or fiberglass body is its susceptibility to deformation. When moving on water, especially in plane, the boat transverses oscillatory movements. If the sonar sensor is rigidly fixed and does not have the ability to bend obstacles or extinguish impacts, there is a high risk of mechanical damage. In addition, the PVC structure itself requires a special approach to installation, since drilling the board for a stationary sensor is a risky decision and often leads to the loss of warranty.

The second important aspect is power supply: small PVC boats rarely have full-fledged generator-charged battery compartments, as in boats, typically using one traction battery for the motor and a separate launcher for sonar and navigation. Energy consumption The device should be minimal so that the charge is enough for a full daylight active fishing without recharging.

⚠️ Warning: Never attach the sonar sensor to the edge of the transom while you have an outboard motor. The exhaust jet and air bubbles create "dead zones" that completely block the signal. Step at least 30-40 cm away from the lower unit side.

Storage is also important, because PVC boats are often put away in a garage or apartment for the winter, which means that the sonar should be easily dismantled, and the size of the body and the weight of the display play a role if you plan to take the device to shore to protect yourself from theft or cold. Compactness In this case, it becomes a functional advantage.

Key technical specifications: frequency and power

When choosing a device, the first thing to look at is the operating frequency of the emitter. For rivers, lakes and reservoirs, where PVC boats are most often used, the optimal range is 83 kHz and 200 kHz. Low frequency (83 kHz) gives a wide angle of view and penetrates greater depths, but gives a less detailed picture. High frequency (200 kHz) shows the smallest details of the bottom and separates nearby objects, but operates at lower depths.

For depths up to 20-30 meters, typical for most inland water bodies, it is enough power in 250-500 W. Chasing indicators of 1000 W and above for a PVC boat with a short transom does not make practical sense, since you simply do not have time to shut down the sensor to the desired depth for the operation of such power, and the battery charge will fly away instantly.

Modern technology allows you to use dual-frequency sensors that switch automatically, and this gives you versatility: today you scan vast spaces for eyebrows, and tomorrow you study the buckle in detail. Adaptability Systems are the key to success in a changing environment.

It's also important to pay attention to the resolution of the screen. Even the most powerful sonar is useless if you can't tell the difference between fish and bottom debris on a three-inch display, and you need good brightness and contrast in the matrix for comfortable day fishing, especially in sunny weather.

Types of sensors and methods of fastening on the transom

The most common option for PVC boats is transducerIt's attached to a special plastic or metal plate, which in turn is screwed or glued to a transom, and there are models that can be quickly removed, which is true for those who keep the boat assembled or are afraid of theft of equipment in the parking lot.

The second option is a sensor that attaches directly to the balloon, which uses special suction cups or glue platforms, and the good thing about this is that it doesn't require transom drilling, but it has a huge disadvantage: when you're on the motor, the sensor often catches water flowing around the soft side, which creates interference, so for PVC motorboats, transmutor mounting is preferable.

• 🔹 Classic transom: reliable, but requires careful installation so as not to damage the balloon in case of accidental impact.
• 🔹 Thrown (Wireless): It is convenient for exploration, but not suitable for constant navigation and tracking of the path.
• 🔹 Built into the john: A rare but convenient option where the sensor is mounted in a plastic box attached to the cylinder.

When you install a transom sensor, it's critical to maintain an angle of inclination, the operating surface of the emitter should be parallel to the surface of the water when the boat is moving, and if the nose of the PVC boat is uplifted when glides, the sensor should be tilted a little harder to compensate for this angle.

⚠️ Note: When you attach the sensor to the transom, use only special brackets with a spring mechanism or a "comb", rigid fixation will cause the sensor to break down when you first hit an underwater obstacle or pull the boat onto a gentle shore.

GPS navigation and mapping

Having a GPS module in the echoer for a motorboat is not just a convenience, it's a safety issue. Being able to see your speed, your path, and most importantly, save points, allows you to return to catchy places and avoid re-passing dangerous drifts. Basic models often have built-in memory with a world map, but the detail of the water bodies there is minimal.

For serious fishing, it makes sense to consider models with support for maps. Navionics or Garmin BlueChartThey allow you to see depths, types of bottom, navigation signs and even the contours of the coastline with high accuracy, and these maps are usually downloaded via an SD card or via Wi-Fi from a smartphone.

Do I need a paid fishing card?

For fishing, a paid map is not strictly mandatory, as you will see the main depths and relief on the sonar screen in real time. However, for navigating unfamiliar bodies of water, especially in fog or at night, a detailed map with navigation information is critical for safety.

Function TrackBack (Truckback) allows you to go back down your path, scanning the bottom again, which is useful if you notice an interesting structure on the screen, but you didn't stop the boat, you just wind the record back and put a dot on the map.

Comparison of popular brands and series

The market is dominated by several big players, each offering solutions for different budgets: Garmin, Lowrance and Humminbird are the leaders. These brands offer proven reliability and availability of parts. Chinese brands like JJ-Connect or Practik often win in price, but can be inferior in detail and quality of software.

Below is a table comparing popular series of sonars suitable for equipping PVC boats:

Brand/Series	Screen type	Frequency (kHz)	GPS	Features
Garmin Striker	Colored/BB	77/200	Built-in	Excellent GPS, simplicity, ClearViu technology
Lowrance Hook	Colored	83/200/455/800	Built-in	DownScan technology, clear interface
Humminbird Helix	Colored	Two-beamed	Optionally.	High detail, modular system
Practik	BB/Color	250	No/Option.	Budget, simplicity, compactness

When choosing between brands, consider the ecosystem. If you already have a navigator or radar of a certain brand, it makes sense to use the same brand sonar for compatibility of maps and sensors. Integration The devices make installation and use easier.

Electricity and interference protection

A PVC motorized boat is a source of electrical interference. The gasoline engine, the ignition system, and the electric motor itself (if any) create noises that can jam a weak sounder signal. Quality appliances have built-in filters, but the proper wire laying is the user's job. The battery power wires and the sensor signal wires should never go in the same tourniquet or parallel to each other.

To power the sonar on the PVC boat, it is best to use a separate small battery (AGM or gel) with a capacity of 7-12 Ah. This ensures that the discharge of the start battery will not leave you without navigation at a critical moment. Quick PowerIt allows you to quickly disconnect the device for charging at home.

It's important to use fuses in the power chain. Short circuits in wet boat wiring can cause expensive electronics to catch fire or fail, and set the fuse as close as possible to the battery terminal.

Frequent errors in selection and installation

One of the most common mistakes is buying a screen that is too large for a small boat. A five-part display on a 3-meter long boat will take up half a transom, interfere with motor control and create sailing. The optimal screen size for PVC boats is from 4 to 7 inches. This is enough for a comfortable view, and the device does not take up much space.

The second mistake is ignoring sun protection, because screens without visors in the bright sun go blind, and fishing turns into divination, if there is no visor in the kit, it should be made or purchased separately, and many people forget about waterproof connector protection, even if the case has IPX7 protection, open wire contacts are a weak point.

⚠️ Warning: Do not leave the sonar in the direct sun in a closed boat in the summer. The temperature inside the PVC cylinder can reach 60-70 degrees, which will cause the battery to bloat and the LCD matrix to fail. Always remove the device or cover the boat with an awning.

The third mistake is the wrong calibration of sensitivity, and beginners often put sensitivity at 100 percent, getting a porridge of noise on the screen. Sensitivity It takes time: reduce the noise level to the point of extinction, and then add 5-10% back.

FAQ: Frequently asked questions

Can I use a fisherman in winter to fish from the ice?

Yes, most modern sonars operate at negative temperatures. However, lithium-ion batteries can run out quickly in the cold, so it's better to keep the device and battery in your inner pocket of clothing, lowering the sensor into the hole only for scanning. Lead acid batteries or special winter models are better suited for permanent operation on ice.

Does the sonar see a fish directly under the boat?

Depending on the angle of the emitter's cone, classical sensors have a dead zone right below them, and to see fish under the boat, side scanning (SideScan) or circular view (360) technologies are used, but they are found in more expensive models. A conventional sonar will show the fish when you swim over it, and it will be in the cone of the beam.

Do I need to calibrate the sounder for fresh and salt water?

Yes, the sound speed in salt water is higher than in fresh water.Water Type) Switch mode between Fresh (fresh) and Salt (salt) if this is not done, the depth readings will have an error of up to 3-5%, which can be critical at great depths.

How often should I change the sensor?

When used carefully, the sensor lasts 5-10 years or more, and only needs to be replaced if the body is mechanically damaged, the cable is broken, or the crystal is degraded (which is rare), and the cables are most often changed if they are rubbed against the transom.