The Airmar DT800PV‑235‑N2: A Smart, Simple Thru‑Hull Transducer for Sailboats and Powerboats

If you’re upgrading your boat’s electronics, you’ve probably heard the term “smart sensor” thrown around. But what does it actually mean for a transducer? And why would you choose a 0‑degree tilt, 235kHz plastic thru‑hull like the Airmar DT800PV‑235‑N2?

Let’s break it down.

What Makes the DT800PV‑235‑N2 Different?

First, the basics: This is a thru‑hull transducer—it mounts through the hull of your boat, giving you a clean, permanent installation. It’s made of plastic (specifically, Airmar’s rugged PV material), which is lighter and less expensive than bronze, and it won’t corrode in saltwater. The element is set at 0‑degree tilt, meaning it’s perfectly vertical—ideal for boats with flat hull sections where a tilted element isn’t needed (most sailboats and many powerboats).

But the real magic is in the “smart sensor” label. Unlike older transducers that require a separate black‑box sounder or converter, the DT800PV‑235‑N2 outputs NMEA 2000® data directly. That means water temperature, boat speed, and depth are sent straight to your compatible chartplotter (Garmin, Simrad, Raymarine, etc.) over a simple NMEA 2000 network cable. No extra boxes, no complicated wiring—just plug and play.

Key Specs at a Glance

• Frequency: 235kHz – excellent for general‑purpose depth sounding and fishfinding in moderate to deep water.
• Tilt: 0° – perfect for flat hulls; no compensation needed.
• Output: NMEA 2000 (PGNs for water temperature, speed, depth).
• Material: Plastic (PV) – lightweight, corrosion‑resistant, cost‑effective.
• Smart Sensor: Built‑in microprocessor provides calibrated, ready‑to‑use data.

Who Should Consider This Transducer?

Sailboat owners often have flat hull sections near the keel, making a 0‑degree tilt the natural choice. The plastic construction reduces weight aloft (important for performance sailors) and eliminates galvanic corrosion concerns.

Powerboat owners with planing hulls that have a flat run aft can also benefit. If your hull doesn’t have a pronounced deadrise where the transducer mounts, a tilted element just adds complexity without improving performance.

And because it’s a smart sensor, you get three key data streams without extra hardware: 1. Water temperature – for finding fishing zones and monitoring engine cooling. 2. Speed through water – critical for accurate navigation and fuel calculations. 3. Depth – the most fundamental safety reading on any boat.

How It Stacks Up Against Other Airmar Models

Airmar makes a huge range of transducers, so it’s easy to get overwhelmed. Here’s a quick comparison:

| Model | Material | Tilt | Frequency | Best For | |-------|----------|------|-----------|----------| | DT800PV‑235‑N2 | Plastic (PV) | 0° | 235kHz | Sailboats, flat‑hull powerboats, budget‑conscious owners | | DT800BV‑235‑N2 | Bronze | 0° | 235kHz | Heavy‑duty commercial use, where extra durability is worth the cost | | DT820 (plastic) | Plastic | 12° or 20° | Dual‑frequency | Boats with deadrise that need a tilted element for better signal | | B75 Series | Bronze/Plastic | Various | Chirp Broadband | Anglers who want the latest CHIRP technology for crystal‑clear fishfinding |

The DT800PV‑235‑N2 sits in the sweet spot: all the smarts of a modern NMEA 2000 sensor, at a price that won’t sink your electronics budget.

Installation Tips

Installing a thru‑hull transducer is a serious job—you’re drilling a hole in your boat, after all. If you’re not comfortable with fiberglass work and underwater sealing, hire a professional. That said, here’s what the process looks like:

1. Choose the location – flat area, away from turbulence, ahead of the propellers. 2. Drill the hole – use the template provided, and seal the edges with epoxy. 3. Mount the transducer – apply marine sealant (like 3M 5200) to the mating surface. 4. Connect the NMEA 2000 cable – run it to your backbone, add a tee, and power up. 5. Calibrate – most chartplotters will auto‑detect the sensor; follow the on‑screen prompts.

Total time for a pro: 2–3 hours. DIY with experience: maybe a weekend.

🎣 Expert Advice from Mack Jennings

I’ve installed dozens of these DT800PV‑235‑N2 sensors at BOE Marine, and here’s what I tell customers:

First, match the tilt to your hull. If you’ve got a flat section (like many sailboats), a 0‑degree tilt is perfect. If your hull has deadrise—say, 12–20 degrees—you’ll want a tilted element (look at the DT820 series). Putting a 0‑degree transducer on a sloped hull means the sound beam shoots off at an angle, giving you false depth readings.

Second, think about frequency. 235kHz is a great all‑rounder. It gives you decent depth penetration and reasonable detail. If you’re mostly in shallow water and want super‑crisp fish arches, consider a 200kHz or even a CHIRP model. But for most coastal cruising and occasional fishing, 235kHz does the job.

Third, plastic vs bronze. Bronze is tougher and better for high‑speed boats or commercial use. Plastic is lighter, cheaper, and corrosion‑free. For 90% of recreational boats, plastic is fine. I’ve seen plastic Airmar transducers last 15+ years in saltwater.

Finally, don’t skimp on the sealant. Use a quality marine adhesive/sealant (I like 3M 5200 or Boat Life Life Calk). Make sure the mating surface is clean and dry. A leaky transducer install is a nightmare you don’t want.

If you’re unsure, visit our contact page or stop by our shop in Stevensville, MD. We’ll help you pick the right transducer and can handle the installation from start to finish.