Garmin GT15M-TH Thru-Hull Mid-Band CHIRP Transducer, 600W, 85-165 kHz, Bronze Housing, 8-Pin, Temp Sensor

Overview

The Garmin 010-12402-20 is a GT15M-TH thru-hull transducer with an 8-pin connector for mid-band CHIRP traditional sonar (85-165 kHz). It runs at 600 W with a listed beamwidth of 24° to 13°, includes a 20 ft (6.1 m) cable, and reads water temperature.

This is the style of transducer you install through the hull below the waterline so the element sits in clean water and keeps a consistent bottom picture when you are running or dealing with chop. Maximum depth is listed up to 1,900 ft (579 m) in freshwater, with real-world results depending on hull, mounting location, and water conditions.

Key features

• Mid-band CHIRP traditional sonar: 85-165 kHz at 600 W.
• Thru-hull mounting for a stable bottom reading when a transom location gets aerated.
• Bronze thru-hull housing and stem for below-the-waterline installation.
• Listed maximum depth up to 1,900 ft (579 m) in freshwater conditions.
• Beamwidth 24° to 13° for a mix of coverage and target separation.
• Built-in temperature sensing for water temp at the display.
• 8-pin connector with a 20 ft (6.1 m) cable for compatible Garmin sonar ports/adapters.

Installation and setup

Plan for a true thru-hull install: drill the hull, bed the stem with marine sealant, and lock the transducer in place using the included anti-rotation hardware so it cannot spin while underway. If your hull is cored fiberglass, the core around the hole should be sealed so water cannot wick into the laminate.

The supported deadrise range is listed as 0° to 6°. On hulls with more angle, a fairing block is typically required to keep the element aimed correctly and to seat the hardware properly against the hull surface.

Compatibility and fit

This model uses an 8-pin transducer connection and is intended for systems that accept Garmin 8-pin sonar inputs (or the correct adapter where applicable). Confirm connector style and sonar support on your display or black box before drilling the hull.

Installation instructions cover cored fiberglass, non-cored fiberglass, wood, and metal hulls. Placement matters for clean water flow, so it is worth checking inside access for the backing nut and hardware before choosing the final spot.

What’s included

• GT15M-TH transducer
• Thru-hull mount
• Mounting hardware
• Documentation

On-board use

This is a solid match for boats that spend time fishing structure and want CHIRP traditional sonar with a thru-hull install instead of a transom mount. It also makes sense when you want water temperature at the helm without adding a separate temp sensor.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Orders of $100 or more qualify for free shipping when eligible. For orders under $100, shipping costs are calculated at checkout based on destination, package weight, and selected service. International shipping is available for eligible products, and certain items may require additional handling, warehouse transfers, or may ship directly from the manufacturer, which can affect processing time.

Deliveries are handled by preferred carriers such as USPS, UPS, FedEx, DHL, and others depending on your location and selected service. Estimated delivery times are displayed at checkout and may vary due to customs processing, carrier delays, weather, postal disruptions, or other circumstances beyond our control. Once your order ships, you'll receive a confirmation email with tracking information. Tracking may take up to 24 hours to update on the carrier's website and is also available through your account when applicable.

We ship throughout the United States and to most international destinations for products eligible for international shipping. International orders may be subject to customs duties, taxes, brokerage charges, or other import fees, which are the customer's responsibility and are not included in the product or shipping price. PO Boxes are accepted only when shipping through USPS, and not all packages qualify for this option. If your order does not arrive within the estimated delivery window, please contact us at info@apollolighting.com or +1 (954) 375-0100 so we can assist with locating your package.

Learn more.

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.

Learn more.

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.

Learn more.