Airmar R509-LH




This is for the serious fisherman- with 2kW high chirp and 3kW low chirp covers all you need for shallow to deep water fishing. The details these show is superior as it will show individual fish not just a blob in deep water so you have a better idea what you are looking at.

Fits the Garmin GSD26 or can be used with the Furuno FCV295 and FCV1150 sounders.

We have mounted these on trailer boats (some hull modification maybe required ) and launches with great results.


Airmar R509LH

Depth & fast-response water-temperature sensor
• Low—CHIRPS from 28 kHz to 60 kHz
23° to 9° port-starboard beamwidth (11° to 5° fore-aft beamwidth)
• High—CHIRPS from 130 kHz to 210 kHz 8° to 4° beamwidth
• 112 kHz of total bandwidth from one transducer
• Covers popular fishing frequencies of 28, 38, 50, and
200 kHz plus everything else in the bandwidth
• Fishing Profile: Commercial and recreational inshore
and offshore fishing (deep-water canyon and
sea-mount tracking)
• Epoxy transducer housing with High-Performance Fairing
• Boat Size: 12 m (40’) and above
• Hull Type: Fiberglass, wood, or metal
R509LH (Low & High-Frequency)

What is Chirp?

Traditional marine fishfinders operate at discrete frequencies such as 50 kHz and 200 kHz, use relatively
short-duration transmit pulses, and use narrowband sonar transducers. In contrast, CHIRP (compressed
high-intensity radar pulse) uses a precise sweep pattern of many frequencies within a long-duration transmit pulse
from a broadband transducer, so the equivalent sound energy transmitted into the water is 10 to 1,000 times
greater than a conventional marine fishfinder. The echo energy returning to the transducer, superior to that
generated by a conventional transducer, is then processed by the fishfinder’s DSP (digital signal processing)
computer and displayed in ultra-sharp detail on the display. The combination of CHIRP, a broadband transducer,
and the fishfinder’s DSP, results in dramatically better fish and bottom detection, superior depth capability, and
significantly better performance at speed.