Installation of the sonar sensor on the PVC boat with NDNDM: a complete guide with photos and tips

Installation of sonar on the PVC boat with hinged transom (HDT) It's a task that requires not only technical precision, but also an understanding of the material of the boat hull. Unlike rigid aluminum or fiberglass boats, PVC material has its own specificity: it's softer, prone to deformation and requires careful handling when installing equipment.transducer) may give distorted readings or fail altogether after the first waves.

In this article, we will discuss all stages of installation From choosing the optimal location for the sensor to adjusting the sonar to specific fishing conditions. BNDD designYou'll learn what tools you'll need, how to avoid PVC drilling errors, and why some "folk" fastening methods can lead to leaks. To illustrate this, we'll give you a comparative table of installation methods and a checklist to check the quality of the DIY installation.

Selection of a sonar sensor for PVC boat with NDNDM

Not every transducer is suitable for PVC boats.

• 🔹 Type of attachment: for BNDT optimal transducer flat-based fitting Avoid suction cups, which are unreliable on the wavelength.
• 🔹 Frequency: for shallow water (up to 30 m) suitable 83 kHzFor deep-sea fishing, 50 kHz or dual models (Lowrance HOOK Reveal, Garmin Striker Plus).
• 🔹 Power:minimally 500 watts For clear signal, models up to 200 watts They often "lose" the bottom at speed.
• 🔹 Cone angle: wide (20-60°) covers a large area, but loses detail.9-12°) more precisely, but requires precise positioning.

For boats with NDND is critical sensor-weightHeavy models (>500 g) can shift the center of gravity of the transom, especially if the motor is already installed. compact transducers weighing 200-400 g (for example, Deeper PRO+ or Humminbird PiranhaMAX 4).

⚠️ Attention: Sensors with embedded GPS (for example, Lowrance Elite FS) require additional protection against moisture. PVC boats cannot be mounted near seams, vibration from the engine can interfere with the tightness.

2. The optimal place for the sensor installation

On boats with NDND, the transducer must be fastened transcentricbut taking into account several factors:

1. Distance to motorminimum 30-40 cm If you're not, the turbulence will distort the signal. 15 hp distance 50 cm.
2. Depth of immersion: the sensor should be below the bottom of the 1-3 cmBut not touching the water when you park, optimally when you're diving while you're driving in the planning.
3. Inclination angle: for transducer sensors, 0-5° A higher angle will cause the signal to be lost at high speeds.

Check the location on the water: if the sensor creates bubble-markIt needs to be shifted left/right or changed angle. PVC boats are often used for this. draw-back (e.g. from Scotty) to avoid vibrations from the transom.

Type of sensor	Advantages	Deficiencies	Recommended models
transom (mixed)	Minimum resistance to water, accurate data	Complex installation, risk of leakage	Lowrance TM150, Airmar TM260
Tranza (invoice)	Simple installation, you can take off for the winter	High-speed vibrations	Garmin GT20, Humminbird XNT 9 20 T
Removable (on bracket)	Universality, angle adjustment	Additional fastenings, price	Scotty 1106 + any sensor
Portable (wireless)	No installation, mobility.	Limited depth, battery dependency	Deeper PRO+, FishHunter Pro

3. Installation tools and materials

To install a sensor on a PVC boat with NDND you will need:

• 🔧 drill You can use a set of wood drills/plastics (not metal!) to match the diameter with the sensor fixture.
• 🔧 Silicone sealant (Soudal Fix All or Moment Herment- only neutral- No acetic acid!
• 🔧 Fastening: stainless bolts/nuts (M5-M8) with wide washers. For PVC, mandatory rubber-stick.
• 🔧 Template. for marking (can be cut from cardboard in the shape of the sensor).
• 🔧 Fen (for softening PVC when inserted) and sandpaper (P120) for edge treatment.

Critically, never use screws or screws to attach the sensor to PVC! They break through the material, lead to microcracks and leaks. For the scaling models, it will also be necessary glue (for example, Bostik 2402and reinforcement to reinforce the stitches.

⚠️ Note: If your boat has a multilayered (for example, Bark, Flagship Profi.), drill at minimum speeds with water cooling, overheating leads to the material being stratified.

Step-by-step installation instructions

Step 1. Marking up

Apply a sensor (or template) to the transom, stepping away from the edge 5-10 cmMark the holes in the anchor with a pencil. For cut-out models, draw a detour. 1-2 mm.

Step 2. Drilling

Start with a small drill (2-3 mm), then expand the holes to the desired diameter.

1. Cut the hole with a jigsaw (with a small tooth).
2. Treat the edges with sandpaper and hair dryer (temperature) 60-70°C).
3. Apply the glue to the edges of the cutout and the sensor, connect and fix with rods on 12:24 hours..

Step 3: Fixing of the overhead sensor

Procedure:

1. Apply the sealant on the base of the sensor and gasket.
2. Press the sensor to the transom, insert bolts from the bottom up.
3. Pull the nuts. cross-overIt's a puff moment, to avoid skewing. 1.5-2 Nm. (Don't pull it over!)
4. Remove excess sealant pre-harden (in 10-15 minutes).

Step 4. Laying the cable

The sensor cable must go:

• 🔸 Along the transmunist or balloon (fix with plastic screeds with stepping stones) 20-30 cm).
• 🔸 Under the seat or in a special canal (if any).
• 🔸 Without inflections and tension - reserve length 10-15%.

What to do if the cable is too short?

If a standard cable is not available, use it. transducer (for example, Lowrance Extension CableNever twist the wires or use household extension cords, which will cause signal loss, and the connection must be soldered and sealed (epoxy resin).

5. Set up the sonar after installation

After installation of the sensor, it is needed calibrate:

1. Sensitivity (art.Sensitivity): start with 70-80%PVC boats often have "noise" from the material, and they can be filtered out. Noise Rejection.
2. Depth (deepness)Depth Range): set on 10-20% For example, for 10 meters, choose the depth of the water. 12 m m m.
3. Color palette: for fishing on a sluggish bottom is suitable ClassicFor the rocky, WhiteLine.
4. Speed of renewal: on small boats, enough is enough 1-2 updates/secsHigh frequency drains the battery.

Do the water test:

• 📊 In the parking lot: the signal should show a flat bottom without "failures".
• 📊 On the move: at speed 10-15 km/h If you see any stripes, check the sensor attachment.
• 📊 On the wave: when pitching the signal may temporarily disappear - this is normal for PVC boats.

⚠️ Note: If the sounder shows "false bottom" (second line below the real line), so the sensor is set at the wrong angle or too close to the motor. Correct position and recalibrate.

6. Common mistakes and how to avoid them

Even experienced anglers make mistakes when mounting a sonar on a PVC boat.

Mistake.	Effects of consequences	How to fix it
Sensor attachment to PVC seam	Seed discrepancy, leaks	Replace the sensor at least by 10cm seamless
Use of acid sealant	Eating PVC, loss of strength	Remove old sealant, apply neutral
Fastening	Transformation, cracks	Reduce the nuts, use a dynamometer key
Cable bent at sharp angle	Wire break, signal loss	Transfer the cable with a bend radius > 5cm
Sensor installed above the waterline	Loss of signal at low speeds	Reset below to 1-2 cm

Another common problem is that electrical disturbanceIf you see chaotic dots on the screen, check:

• 🔌 Distance between sensor cable and motor/battery wires (should be > 30cm).
• 🔌 Echo sonar grounding (on PVC boats often missing - use virtual-mass through the battery.
• 🔌 Screened cable (if your sonar supports).

7. Care for the sensor and sonar

To ensure that the equipment lasts longer:

• 🧹 After each fishing, flush the sensor. freshwater (Do not direct the jet under pressure!)
• 🧹 Once a season, lubricate the fasteners silicone (for example, WD-40 Specialist).
• 🧹 In the winter, remove the sensor (if it is overhead) and store in a dry place at temperature. 0-20°C.
• 🧹 Check the tightness of the attachment before the season - if necessary, update the sealant layer.

For in-line sensors:

• 🔧 Every 2 years, check the place of the insert for microcracks.
• 🔧 When bubbles appear under the glue - remove the old glue, clean the surface and glue again.

⚠️ Warning: Never use a sensor to clean the sensor abrasives Or solvents (acetone, gasoline) that damage the protective coating of the transducer and cause corrosion.

FAQ: Frequent questions about installing a sonar on a PVC boat with NDND

Can I install a sensor without drilling?

Yes, but these are the ways (Suctions, screeds, double-sided scotch) unreliable at speeds above 10 km/h Or in the middle of a wave. Deeper PRO+ (wireless sensor), but its accuracy is lower than stationary models.

Which sealant is better for PVC?

Best options:

• 🔹 Soudal Fix All Crystal - transparent, neutral, does not turn yellow.
• 🔹 Moment Herment Universal Budget, but requires application in 2 layers.
• 🔹 3M Marine Adhesive Sealant 5200 - professional, but expensive.

Avoid sealants with acetic acid (see below).For example, ordinary plumbing silicone- they destroy PVC!

Do I need to take off the sensor for the winter?

Depends on the type of attachment:

• 🔹 Overhead sensors It is desirable to remove to avoid corrosion of the fastener.
• 🔹 Switching sensors - You can leave, but check the leakage before preservation.

If the boat is stored outside, seal the sensor waterproof (for example, 3M Scotch 2228).

Why does the sounder show the wrong depth?

Causes and solutions:

• 🔸 Wrong angle of sensor → Adjust the slope (0-5° down).
• 🔸 Engine interference → Move the sensor further away from the screw.
• 🔸 Wrong setup Keel Offset → set 0.3-0.5 m.
• 🔸 Dirt on the sensor → Clean the surface with a soft sponge.

Can I install two sensors on one boat?

Technically yes, but there are nuances:

• 🔹 The sensors must be working on frequency (for example, 50 kHz and 200 kHz).
• 🔹 The distance between them is a minimum. 50 cmOtherwise, there'll be interference.
• 🔹 It will. splitter (for example, Lowrance Y-Cable) or two separate sonars.

On PVC boats with NDNDM, this is rarely justified - it is better to choose one high-quality sensor with a wide angle (see below).For example, Airmar TM260).