Garmin GSD 26 Digital Black Box Network Sounder, Garmin Marine Network, CHIRP Spread Spectrum, Dual Transceiver, 10-35V, IPX7, 25-3000W RMS, 25-250 kHz, 10,000 ft Max Depth

Overview

The Garmin 010-00958-00 is a black box sonar module that puts CHIRP/spread-spectrum sonar on your Garmin Marine Network so you can view returns on a compatible Garmin chartplotter or MFD. It runs on 10-35 VDC, covers 25-250 kHz depending on the transducer, and supports sounder power from 25 to 3,000 W RMS.

It can run two transducers at once using its dual-transceiver architecture, which helps on boats with multi-transducer layouts or when you want independent sonar operation at the same time. Maximum depth is rated up to 10,000 ft (3,048 m) depending on transducer choice and water conditions.

The enclosure is fully gasketed and water resistant to IEC 60529 IPX7, with a size of 274 x 373 x 100 mm (10.8 x 14.7 x 3.9 in.). Power usage is up to 100 W and the recommended fuse is 10 A.

Key features

• Outputs sonar data over the Garmin Marine Network for display and control on a compatible Garmin chartplotter or MFD
• Dual-transceiver design supports simultaneous and independent transducer operation
• Frequency range 25-250 kHz (transducer dependent) for traditional sonar and CHIRP/spread-spectrum transducer setups
• Sounder power rated 25-3,000 W RMS (dependent on transducer rating and depth)
• Maximum depth rating up to 10,000 ft (3,048 m), dependent on transducer, water salinity, bottom type, and conditions
• 10-35 VDC input for 12 V and 24 V systems; draws up to 100 W and uses a 10 A fuse
• Fully gasketed aluminum and steel housing with IPX7 water resistance; compass-safe distance 60 cm (23.6 in.)
• Operating temperature range from -15 to 70 C (5 to 158 F)

Installation and setup

Mount the module in a location where it cannot be submerged and where it has ventilation around the case. Leave enough clearance to route and service the power lead, the marine network cable, and the transducer wiring at the terminal block.

Keep the power run clean and protected with the specified 10 A fuse, and plan cable routing away from heat sources and moving parts. Maintain the 60 cm compass-safe distance when choosing a mounting spot and routing cables near sensitive instruments.

Compatibility and system integration

The GSD 26 sends sonar over the Garmin Marine Network and relies on a compatible Garmin display for control and on-screen views. A transducer is required, and the results you see depend heavily on matching the transducer type and power rating to the hull, typical depths, and bottom conditions you fish.

Transducer connections terminate on the internal terminal block, and the module supports common CHIRP/spread-spectrum wiring layouts, including single-element and dual-element arrangements. Taking time to verify wire mapping and strain relief before final tightening helps avoid intermittent sonar performance later.

Use cases on board

This module fits boats that already run a Garmin Marine Network display and want a dedicated sounder with headroom for deeper water work. It also suits multi-transducer installations where two independent sonar sources need to be available at the same time.

What's included

• GSD 26 main unit
• Power connection cable
• Marine networking cable (6 ft)
• Mounting hardware
• Software refresh SD card
• Documentation

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.

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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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