Airmar B258 - Sonde traversante bronze 1kW (50/200kHz) + température - (8 broches) - Garmin

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Airmar B258 - Bronze Through-Hull Transducer 1kW (50/200kHz) + Temperature - (8-pin)

Designed for deep-sea fishing, the GARMIN Airmar B258 fishfinder is a bronze through-hull model rated at 1 kW (50/200 kHz) with a temperature sensor. Its four-ceramic-element construction delivers increased sensitivity and elliptical beams for precise detection down to 670 m (2,200 ft). This model is a benchmark for vessels 9 m (30 ft) and longer, offering a powerful alternative to CHIRP fishfinders.

Includes: Airmar B258 transducer with 10 m (33 ft) cable and 8-pin connector, high-performance fairing block.

Retail priceBenefit from the professional rate

948,28€

948,28€ ~~1.249,99€~~

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In stock

Free pickup point shipping over €150 in France
Pickup at Skysat possible

Custom installation

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Installers near you

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Support service

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Technical specifications

Supported sonar technologies	CHIRP, Traditional Sonar
Fishfinder frequencies	50/200
Peak power	1000.0
Max depth reading	670.0
Transducer material	Bronze
Sonar connector type	8-pin
Product width	30 mm
Integrated temperature sensor	Yes
Compatible displays	Garmin chartplotters/depth sounders compatible with 8-pin (ex: GPSMAP, ECHOMAP, Striker, GSD24, GSD26). Requires an adapter cable (010-11612-00) for Garmin 6-pin depth sounders.
Bus compatibility	Garmin owner (8-pin)
Wired network	Garmin owner (8-pin)
Wireless connectivity	No
Mounting type	Transom
Certifications	CE
Beam coverage angle	14°x23° (50 kHz) / 3°x5° (200 kHz)
Beam Width At 200khz	3x5
Beam Width At 50khz	14x23 or 15x21
Ceramic Element Count	4
Fishing type	Sea, Lake, River, Trolling, Deep water
Hole Saw Diameter Transducer Mm	30
Integrated speed sensor	No
Max Deadrise Angle	26
Max Depth Rating 200khz	294
Max Depth Rating 50khz	670
Transducer Operation Condition	Always operate in water
Transducer Type Detail	Fixed frequency
User level	Intermediate
Vessel Length Compatibility M	9 and up

Detailed description

Designed for deep-water fishing and precise seabed detection, the bronze through-hull GARMIN Airmar B258 transducer is a 1 kW solution offering depth and water temperature sensing capabilities. Operating at dual frequencies of 50 kHz and 200 kHz, it is suitable for fiberglass or wooden hulls and connects via an 8-pin connector to compatible Garmin equipment.

Technical Performance and Versatility

The B258 transducer stands out with its 1 kW power, enabling it to reach depths of 441 to 670 meters at 50 kHz and up to 294 meters at 200 kHz. Its construction includes four ceramic elements, providing 25 times the sensitivity of a 600 W single-element 50/200 kHz transducer. The elliptical beams (14°x23° or 15°x21° at 50 kHz and 3°x5° at 200 kHz) ensure wide coverage and effective target resolution. Compared to models like the B45 or SS505, which are more compact, the B258 is designed for vessels 9 meters and larger, requiring greater range and better underwater definition. It serves as a robust alternative to CHIRP transducers in the B265/B275/B285 series for users prioritizing traditional high-power fixed frequencies.

Installation and Hydrodynamic Optimization

The through-hull installation of the B258 includes a high-performance fairing block. This fairing block ensures laminar water flow beneath the transducer face, delivering clear and stable displays at speeds up to 30 knots (34 MPH). The fairing block accommodates hull deadrise angles from 0° to 26° and requires a 30 mm (1 3/16 inches) hole for the main transducer body installation, as well as a 14 mm (9/16 inches) hole for the anti-rotation bolt, essential for fairing stability. Installation is recommended on fiberglass or wooden hulls. The B258 offers versatility for various fishing applications, from coastal and offshore trolling to structure and deep-seabed detection.

Documentation

Type	Nom
	Installation Notice - Airmar B258 Installation Instructions (D-17-276-01) (EN)
	Installation instructions - Airmar B258 (D-17-280-01) installation guide (EN)
	Installation Guide - Foulfree Insert for Airmar Transducer Protection
	Installation Guide - Airmar B45/B258/B260/SS260/SS505 Transducer Owner’s Guide
	Installation notice - Installation instructions for high-performance Airmar fairing
	Technical drawing - Airmar B258 transducer technical drawing
	Technical Reference - Technical Specifications for Airmar B258 Depth Sounder (50/200 kHz) (EN)
	Technical Brochure - Airmar B258 Thru-Hull Transducer Brochure (50/200 kHz) (EN)

Expert opinion

Pol CONIN

Digital Manager

« Technical analysis of the Airmar B258 depth sounder: 1kW for deep waters »

The Garmin Airmar B258 depth sounder is a judicious choice for boaters and anglers requiring significant detection capability in deep waters without opting for CHIRP technology. Its 1 kW power and 50/200 kHz frequencies make it particularly effective for identifying the water column and characterizing the seabed at significant depths, where a 600 W depth sounder would show its limits. The four-ceramic-element construction is a major asset, providing increased sensitivity and elliptical beams that improve target detection, especially in 50 kHz mode for broader coverage.

The integration of a high-performance fairing block is a key element of the B258's value proposition. It is not merely a protective component but an essential part of maintaining optimal acoustic performance at high speeds. The fairing block ensures laminar flow beneath the depth sounder, minimizing turbulence and parasitic noise on the display, which is crucial for reading echoes during fast trolling or cruising. The through-hull bronze installation restricts this model to fiberglass or wooden hulls, a point to consider to avoid electrolytic corrosion on metal hulls. Drilling the 30 mm hole for the depth sounder and the 14 mm hole for the anti-rotation bolt of the fairing block must be done with precision, respecting the hull's deadrise angle to ensure beam alignment. This model is particularly suited to medium to large sportfishing boats that operate regularly in open sea.

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Airmar B258 - Bronze Through-Hull Transducer 1kW (50/200kHz) + Temperature - (8-pin)

948,28€

948,28€ ~~1.249,99€~~

Frequently Asked Questions

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What are the main features of the GARMIN Airmar B258 transducer?

The GARMIN Airmar B258 is a bronze through-hull transducer rated at 1 kW, operating at frequencies of 50/200 kHz. It includes a water temperature sensor and connects via an 8-pin connector. It is designed for deep-water fishing and precise seabed detection.

What is the transmission power of this transducer?

The GARMIN Airmar B258 transducer has a transmission power of 1 kW (1000 Watts).

Which frequencies does this transducer use?

This transducer operates on dual frequencies of 50 kHz and 200 kHz.

What are the depth detection capabilities of the B258 transducer?

At 50 kHz, the transducer can reach depths of 441 to 670 meters. At 200 kHz, it can detect down to 294 meters.

Does the Airmar B258 transducer include a temperature sensor?

Yes, the GARMIN Airmar B258 transducer integrates a water temperature sensor.

What is the particularity of the ceramic elements in the B258 transducer?

The B258 transducer integrates four ceramic elements, giving it a sensitivity 25 times greater than a single-element 50/200 kHz 600 W transducer.

What are the beam angles of the B258 depth sounder?

The beams are elliptical. At 50 kHz, the angles are 14°x23° or 15°x21°. At 200 kHz, the angle is 3°x5°.

For which type of vessel is the Airmar B258 transducer recommended?

The Airmar B258 transducer is designed for vessels 9 meters and longer, requiring extended range and enhanced underwater resolution.

How does the B258 fishfinder differ from the CHIRP models?

The B258 is positioned as a robust alternative to the CHIRP fishfinders in the B265/B275/B285 series for users who prefer traditional high-power fixed frequencies.

Which hull types is the Airmar B258 transducer compatible with?

The Airmar B258 bronze through-hull transducer is recommended for fiberglass or wood hulls only.

What type of connector does the B258 transducer use?

The B258 transducer uses an 8-pin connector for connection to your compatible Garmin equipment.

Can this transducer be installed on a metal hull?

No, a bronze transducer like the B258 must never be installed on a metal hull. This could cause electrolytic corrosion.

Does the B258 transducer installation require a fairing?

A high-performance fairing is strongly recommended if the hull deadrise angle exceeds 10°. It aligns the sonar beam downward and ensures clean water flow under the transducer, optimizing performance.

What is the maximum deadrise angle for installing the B258 transducer with a fairing?

The maximum deadrise angle (deadrise angle) for installing the B258 transducer with a fairing is 26°.

What are the dimensions of the hole to drill for the B258 depth sounder?

For the B258 depth sounder, the main hole to drill in the hull must be 30 mm or 1-3/16 inches. A pilot hole of 3 mm or 1/8 inch is recommended initially.

Is an anti-rotation bolt required with the fairing?

Yes, installing the anti-rotation bolt is mandatory with the high-performance fairing. This bolt firmly secures the fairing in place and prevents it from rotating during navigation. The hole for this bolt must be 14 mm or 9/16 inches.

How to position the fairing on the hull?

The fairing must be installed parallel to the keel. The end of the fairing with the arrows or triangular cutout must always point toward the bow of the boat.

What precautions should be taken when applying antifouling coating to the depth sounder?

It is recommended to use a water-based antifouling paint, mandatory in saltwater. Airmar certifies that applying Foulfree coating does not result in any loss of depth sounder performance. This coating is non-toxic, creates an ultra-smooth surface, and prevents marine growth from adhering, ensuring optimal performance.

Where should the depth sounder transducer be installed on the boat for optimal performance?

The transducer must be installed in an area with smooth water flow, minimal bubbles and turbulence, and must always remain submerged. It should be at least 300 mm (1 foot) away from the keel and propellers/shafts to avoid interference. For powerboats, it is typically placed just forward and to the side of the engines, or ahead of the propellers for inboards.

Is it necessary to check waterproofing after installation?

Yes, it is imperative to immediately check for any leaks once the boat is launched. Do not leave the boat unattended for more than three hours after launch, as even a small leak can accumulate a significant amount of water.