Garmin B75 Thru-Hull Transducer, CHIRP, 600W, 8-Pin, Bronze Housing

Overview

The Garmin B75 is a bronze, low-profile thru-hull CHIRP transducer family with a 600 W rating, depth sensing, and fast-response water-temperature sensing. It is offered in Mid-CHIRP (80 to 130 kHz) or High CHIRP (130 to 210 kHz) to match the water you run and the type of targets you want to separate.

Mid-CHIRP versions cover 80 to 130 kHz with a 24° to 16° beamwidth and are rated to a maximum depth of 274 m (900 ft). High CHIRP versions cover 130 to 210 kHz with a 15° to 9° beamwidth and are rated to a maximum depth of 214 m (700 ft). Installation is a true thru-hull that uses a 70 mm (2-13/16") hole, with a 95 mm (3.75") usable shaft length.

The internal tilt element is fixed at 0°, 12°, or 20° so the sonar beam points straight down when the unit is mounted close to flush. Match the tilt to the hull deadrise at the install location: 0° for 0° to 7°, 12° for 6° to 15°, and 20° for 16° to 24°. The bronze housing is intended for fiberglass or wood hulls and is commonly used on stepped, planing, or displacement hull forms.

Key features

• 600 W single-band CHIRP transducer with depth and fast-response water-temperature sensing
• Mid-CHIRP option: 80 to 130 kHz with 24° to 16° beamwidth
• High CHIRP option: 130 to 210 kHz with 15° to 9° beamwidth
• Fixed internal tilt options (0°, 12°, 20°) to match hull deadrise without adding a fairing block
• Thru-hull mounting with 70 mm (2-13/16") hole size and 95 mm (3.75") usable shaft length
• Bronze housing for fiberglass or wood hulls, with a low-profile shape that sits close to flush when installed correctly

Variants

This product is offered in multiple configurations to match both hull deadrise and sonar band.

The differences across the range are the fixed tilt angle (0°, 12°, or 20°) and the CHIRP frequency band (Mid-CHIRP or High CHIRP).

• 010-11636-20: Tilt 0° and CHIRP Frequency Mid-CHIRP. A 0° tilt matches flatter mounting areas (0° to 7° deadrise) while keeping the beam pointed down.
• 010-11636-21: Tilt 12° and CHIRP Frequency Mid-CHIRP. A 12° tilt aligns with moderate deadrise sections (6° to 15°) so the transducer can sit close to flush.
• 010-11636-22: Tilt 20° and CHIRP Frequency Mid-CHIRP. A 20° tilt matches higher deadrise areas (16° to 24°) where a straight 0° element would aim the beam off to the side.
• 010-11634-21: Tilt 12° and CHIRP Frequency High CHIRP. High CHIRP uses a narrower beam, which helps when you want tighter target separation in shallower water.
• 010-11634-22: Tilt 20° and CHIRP Frequency High CHIRP. This combines the higher-deadrise tilt range (16° to 24°) with the High CHIRP band for detailed returns in shallower water.

Installation and setup

Because this is a thru-hull install, plan on drilling a 70 mm (2-13/16") hole and having clear access inside the hull for the nut and cable routing. Pick a location that stays in clean water at speed and is clear of turbulence sources like strakes, steps, and intakes. A close-to-flush install helps keep drag down and protects the transducer from impact.

Sonar and system integration

Verify that your sonar source supports the band you are selecting (Mid-CHIRP vs High CHIRP) and that the connector and port type match your system before you commit to cable routing. Once connected, you will get depth plus water-temperature data from the built-in sensor.

Use cases on board

Mid-CHIRP is a solid fit for boats that split time between shallow and mid-depth water and still want meaningful bottom detail. High CHIRP is a better match when you spend more time in shallower water and care about separating targets near structure.

This transducer family makes sense for fiberglass and wood-hull boats where you want a low-profile thru-hull installation and you can choose a fixed tilt that matches the deadrise at the mounting spot.

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Returns may be requested within 30 days of receiving your order. Items must be unused, uninstalled, unaltered, and returned in their original packaging with all tags, packing materials, blank warranty cards, manuals, instructions, accessories, and included items. Certain products, including installed or used electronics, electrical components, lighting, consumables, custom or special-order items, cut-to-length products, safety equipment, and merchandise exposed to water or marine conditions, may not be eligible for return.

To request a return, sign in to your account and select the applicable order and items, and submit your request for review. Eligible unfulfilled items may also be submitted for cancellation within 1 hour of placing the order. Returns or cancellations are not considered approved until you receive confirmation from Apollo Lighting. Please do not ship or drop off merchandise before receiving return approval and instructions.

Customers are responsible for arranging and paying for return shipping unless the return is due to an error by Apollo Lighting or the item is verified as defective, damaged, or incorrect. Missing, damaged, defective, or incorrect items must be reported within 2 business days of delivery, and photos or other documentation may be required for review. If the issue is verified, Apollo Lighting may provide or reimburse return shipping and issue a replacement or refund depending on the circumstances. International customers are responsible for return shipping, duties, taxes, customs charges, brokerage fees, and other costs associated with an international return.

After your return is received and inspected, approved refunds are issued to the original payment method and may take 5-7 business days to appear after processing. Original shipping and handling charges are nonrefundable, and the value of any included free items that are not returned may be deducted from the refund. Apollo Lighting does not charge a standard restocking fee on eligible returns. Returns that are incomplete, damaged, installed, used, altered, improperly packaged, or otherwise do not meet the eligibility requirements may be refused. We recommend using a trackable and appropriately insured shipping service for all customer-arranged returns.

For assistance, contact info@apollolighting.com or call +1 (954) 375-0100.

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Many products sold by Apollo Lighting include a manufacturer's warranty covering defects in materials or workmanship. Warranty terms vary by brand, product category, and model, so eligibility, coverage duration, exclusions, and available remedies are determined by the applicable manufacturer. We recommend reviewing the warranty information provided with your product before installation or use, especially for marine electronics, navigation equipment, lighting, electrical systems, pumps, safety equipment, and other specialized marine products.

If you need warranty service, the claim must follow the process established by the manufacturer, authorized service center, or designated warranty provider. You may be asked for proof of purchase, a serial number, product registration, photos, maintenance or installation records, or other documentation. Apollo Lighting does not determine or modify a manufacturer's warranty coverage or final claim decision, but we are happy to help provide purchase information and direct you to the appropriate manufacturer or warranty resource.

Keep your receipt, product documentation, serial number information, and original packaging when practical. Damage caused by normal wear, misuse, improper installation, insufficient maintenance, corrosion, impact, unauthorized modifications, electrical issues, or operation outside the manufacturer's specifications may not be covered. Warranty claims are separate from standard returns, so a product that has been installed, used, or exposed to marine conditions may no longer qualify for return while still remaining eligible for evaluation under the manufacturer's applicable warranty.

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