Furuno B175L Thru-Hull CHIRP 20-Degree Transducer
Best deep-water sonar for serious offshore anglers with fiberglass hulls.
The Furuno B175L is a powerful low-frequency CHIRP transducer designed for detailed bottom structure and fish finding. Its low-profile bronze thru-hull housing is optimized for fiberglass or wood hulls with deadrises between 16 and 24 degrees. This transducer provides accurate depth and water-temperature data, operating in the 40-60 kHz range to achieve impressive depths. It ensures reliable integration with its included 33-foot cable and Furuno 10-Pin connector, making it an excellent choice for enhancing your vessel's sonar capabilities.
$1329.00
Owner Satisfaction
4.7
/ 5
Category Rank
4
/ 167
#4 in Fish Finders
Price vs Category Average
+30%
Above average
Mounting Style
Low Profile Tilted Element Thru Hull
/ Low Profile Tilted Element Thru Hull
Who it's for
- Offshore anglers targeting species in extreme depths
- Serious fishermen needing precise target identification
- Captains requiring reliable sonar data while cruising
Who should skip it
- DIY boaters uncomfortable with invasive hull modifications
- Budget-conscious owners seeking entry-level sonar solutions
- Inshore anglers prioritizing high-resolution shallow water structure
Performance breakdown
Deep Water Penetration
Low-frequency CHIRP technology reaches impressive depths with exceptional signal clarity.
Hull Integration
Tilted element design ensures a flush fit on most deadrise hulls.
Target Separation
CHIRP processing provides clear distinction between bottom structure and individual fish.
Build Durability
Rugged bronze housing withstands harsh marine environments for long-term reliability.
Coverage Width
Wide beam angle offers a broad view of the surrounding water column.
System Compatibility
Standard Furuno 10-pin connector allows for seamless plug-and-play sonar integration.
Key Specs
Mounting Style
Low Profile Tilted Element Thru Hull
Power Output
1000 Watts (1kW)
Frequency Range
40-60 kHz (Low Frequency CHIRP)
Max Depth
762 meters (2500 feet)
Beam Angle
32-21 Degrees
Cable Length
33 feet (10M)
Housing Material
Bronze
Connector Style
Furuno 10-Pin
Features
- 1kW low frequency CHIRP sonar performance
- Low-profile bronze thru-hull housing
- Optimized for fiberglass or wood hulls
- Accurate depth and water temperature
- Effective for shallow water detail
- Wide beam angle for broad coverage
- Includes a long 33-foot cable
What customers say
Customers highly regard the Furuno B175L for its unparalleled sonar performance and reliability, calling it a game changer for deep water fishing. The core praise focuses on exceptional target separation and clarity, especially in depths over 500 feet or at high speeds. Users confirm the CHIRP technology clearly distinguishes bait balls, thermoclines, and individual fish, leading to better mapping and improved catch rates. While the price is premium, experienced anglers feel the performance gains fully justify the investment. The stability and lack of interference from this thru-hull model are significant advantages, solidifying its status as a necessary tool for serious offshore pursuits.
Know before you buy
This transducer is designed specifically for fiberglass or wood hulls. It features a tilted element housing optimized for deadrise angles between 16 and 24 degrees.
Low-frequency CHIRP is ideal for deep-water performance and penetrating the water column to reach depths of up to 2,500 feet. It provides a wider beam angle, which is excellent for covering more area while searching for structure or fish.
The B175L includes an integrated temperature sensor, so it provides both accurate depth and water temperature data through a single installation.
Yes, this model comes equipped with a standard Furuno 10-pin connector. As long as your display unit supports 1kW CHIRP sonar and uses the 10-pin interface, it should be a direct plug-and-play connection.
The B175L uses a low-profile design, meaning it sits nearly flush against the hull. This minimizes drag and reduces the risk of damage compared to traditional, high-profile thru-hull transducers.
No, this bronze housing is not suitable for metal hulls due to the risk of electrolytic corrosion. It is intended strictly for fiberglass or wood construction.
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$1329