The Airmar R509C-LM delivers 3kW of CHIRP power through a thru-hull installation, covering 82 kHz of total bandwidth from a single transducer. Built with an epoxy housing and high-performance fairing, it places the transducer face in clean, bubble-free water below the hull boundary layer — enabling reliable tracking at speeds exceeding 30 knots. The integrated fast-response water-temperature sensor rounds out a capable package for serious offshore and deep-water fishing on larger vessels.

Features:

• Depth and fast-response water-temperature sensor
• Epoxy transducer housing with high-performance fairing
• Suitable for hulls up to 25° deadrise
• 82 kHz of total bandwidth from a single transducer
• Fairing compensates for hull deadrise and reduces turbulence over the transducer face, allowing tracking at speeds over 30 knots (35 MPH)
• When mounted forward of propellers and running gear, the thru-hull design produces maximum signal return with no onboard interference
• Best suited for vessels 25 feet and up, where the transducer face sits in clean water below the boundary layer

Specifications:

• Boat size: 12 m (40 ft.) and above
• Hull type: Fiberglass, wood, or metal
• Engine type: Inboard, outboard, or I/O

Low Band (28 kHz – 60 kHz):

• Port/starboard beamwidth: 23° to 9°
• Fore-aft beamwidth: 11° to 5°
• Maximum depth: 10,000 ft.

Medium Band (80 kHz – 130 kHz):

• Beamwidth: 13° to 8°
• Maximum depth: 3,000 ft.

Bottom Coverage Relative to Depth:

• 50 ft. depth: 10 ft. coverage
• 100 ft. depth: 24 ft. coverage
• 300 ft. depth: 68 ft. coverage
• 600 ft. depth: 136 ft. coverage
• 1,000 ft. depth: 228 ft. coverage
• 1,500 ft. depth: 340 ft. coverage
• 2,000 ft. depth: 456 ft. coverage
• 2,500 ft. depth: 570 ft. coverage

This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.

Resources:

• Product Brochure (PDF)