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B75 Transducer

Low-profile tilted through-hull single-band 600W CHIRP fishfinder transducer.

The B75C is available with zero, twelve or twenty degrees tilt in the High (H), Medium (M) or Low (L) bands. There is no 20 degree Low band model.


Type CHIRP single-band fishfinder transducer
Low BandFrequency range 40-75 kHz / Beam width 32-21°
Medium BandFrequency range 80-130 kHz / Beam width 24-16°
High BandFrequency range 130-210 kHz / Beam width 15-9°
Power Rating600 watts
Mounting Low-profile through-hull
Housing Bronze
Hull Aperture2.8125" (70mm)
Usable Shaft Length3.75" (95mm)
Cable Length 10 meters
Mix and Match
Temperature Sensor
Speed Sensor Χ
Retractable Insert Χ
Status In production
Reference Page View the B75 page on the Airmar website


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Base Models

These Mix and Match base models must be combined with a Mix and Match cable for installation. The suffix '-MM' in the Gemeco part number designates a Mix and Match base model.

TransducerGemeco Part #Airmar Part #TiltDescription
B75C-0-H-MM41-554-2-01High Band, zero tilt
B75C-0-L-MM41-549-2-01Low Band, zero tilt
B75C-0-M-MM41-551-2-01Medium Band, zero tilt
B75C-12-H-MM41-555-2-0112°High Band, 12 degree tilt
B75C-12-L-MM41-550-2-0112°Low Band, 12 degree tilt
B75C-12-M-MM41-552-2-0112°Medium Band, 12 degree tilt
B75C-20-H-MM41-556-2-0120°High Band, 20 degree tilt
B75C-20-M-MM41-553-2-0120°Medium Band, 20 degree tilt

Mix and Match Cables

This transducer uses the CHIRP Mix and Match system. Installation requires two parts - a base model plus one of the CHIRP Mix and Match (MMC) cables listed below.

Each base model has a 9 meter pigtail cable permanently attached. This cable ends in an Airmar 11-pin female connector. The Mix and Match cables are 1 meter long and have a male Airmar 11-pin connector at one end (to connect to the transducer pigtail) and a brand-specific connector at the other end (to connect to the sounder or fishfinder). If an owner changes their fishfinder or sounder, a different MMC cable can be installed without disturbing the transducer itself or needing to re-run cable through the boat.

Cable ConnectorGemeco Part #Airmar Part #LengthEquipment
MMC-033-1359-011 metersBare wire applications
MMC-11R-HM33-1402-011 metersRaymarine High/High Wide/Medium Band 11-pin
MMC-11R-LDB33-1357-011 metersRaymarine Low & Dual-Band 11-pin
MMC-12G33-1356-011 metersGarmin orange 12-pin
MMC-14HB33-1386-011 metersHumminbird 14-pin
MMC-8G33-1354-011 metersGarmin blue 8-pin
MMC-9N33-1394-011 metersNavico 9-pin
MMC-9N233-1395-011 metersNavico Dual 9-pin
MMC-BL33-1355-011 metersLowrance/Simrad blue 7-pin
MMC-BL233-1358-011 metersLowrance/Simrad Dual Y-cable blue 7-pin
MMC-HB33_1385-011 metersHumminbird #9

Replacement Parts

PartAirmar Part #Description
02-143-01Bronze Hull Nut
09-1012-01Rubber Washer
75WR-1Crows Foot Wrench
75WR-2Single Handle Wrench
75WR-3Double Handle Wrench
75WR-4Single Handle Wrench