B765LM Depth/Temperature Transducer

Part # B765LM

The B765LM is a bronze, thru-hull CHIRP transducer, ideal for sportfishing and commercial vessels. This dual-channel design combines Low CHIRP for great depth penetration with Medium CHIRP for high resolution.

Key Features

  • 40-75 kHz Low CHIRP with 32-21° beam width
  • 80-130 kHz Medium CHIRP with 24-16° beam width
  • Up to 610 m (2000 ft) range with Low CHIRP
  • 2 internal broadband ceramics
  • Thru-hull with bronze housing and high-performance fairing
  • Suitable for fiberglass and wood hulls
  • Ideal for sportfishing and commercial vessels
  • All the advantages of larger thru-hull CHIRP transducers, for smaller boats
  • Recommended for use with the BSM-3 broadband sounder module
Where To Buy

    Dual Channel CHIRP

    Using pulsed transmissions swept across a range of frequencies, CHIRP technology delivers superior target resolution and depth penetration to traditional single-frequency sonar. This dual-channel CHIRP transducer operates in the 40-75 kHz Low CHIRP frequency range with a 32-21° beam width, and the 80-130 kHz Medium CHIRP frequency range with a 24-16° beam width. With Low CHIRP, the B765LM provides an operating depth of up to 610 m (2000 ft).


    One sensor does it all. Able to measure both depth and temperature in a single package, the B765LM simplifies installation and requires just one connection to your echosounder module or multifunction display.


    With bronze housing, the B765LM is suitable for thru-hull mounting in fiberglass and wood hulls. Thru-hull mounting places the transducer in the water on the outside of your boat’s hull; a hole must be drilled for installation, and a fairing block (included) is required to ensure proper alignment. This typically offers the best depth measurement and fishfinding performance.

    Calculate the beamwidth for this transducer

    B765LMFrequencyCone AngleBeamwidth
    80 kHz 23°  
    130 kHz 16°  
    40 kHz 32°  
    75 kHz 21°  
    Depth: Update
    NB: depending on the strength of your transducer pulse