Garmin GCV 20 Ultra HD Scanning Sonar Black Box, For GT34UHD, ClearVü/SideVü, 500W RMS, IPX7

Overview

The Garmin GCV 20 is an Ultra High-Definition scanning sonar black box that adds ClearVü and SideVü views to a compatible chartplotter over the Garmin Marine Network. It runs on 10 to 35 Vdc (works on 12 V and 24 V systems) and transmits at 500 W RMS.

The module measures 192 x 251 x 66 mm (7.6 x 9.9 x 2.6 in.) and uses a fully gasketed polycarbonate case with an IPX7 water rating. It is meant to be mounted where it cannot be submerged, with ventilation around the unit, and at least 260 mm (10.2 in.) from a magnetic compass.

Key features

• Outputs sonar data to compatible chartplotters over the Garmin Marine Network
• Supported CHIRP frequencies: 260, 455, 820, and 1120 kHz for ClearVü and SideVü scanning
• 500 W RMS transmit power for Ultra High-Definition scanning performance
• Power input from 10 to 35 Vdc with 10.5 W maximum power usage
• Uses a 4.0 A fast-acting mini blade fuse in the in-line fuse holder
• IPX7 water rating with a fully gasketed polycarbonate housing
• Three Garmin Marine Network ports for tying into a networked helm setup

Variants

This sonar module is offered in two configurations based on whether a transducer is included in the box.

Both options use the same networked black box approach: connect the module to the Garmin Marine Network, provide fused DC power, then connect a GT34UHD-series scanning transducer to generate Ultra High-Definition ClearVü and SideVü images.

• 010-02055-10: Includes transducer No. This configuration supplies the black box sonar module and is used when a compatible GT34UHD transducer is being sourced separately.
• 010-02055-00: Includes transducer Yes. This configuration includes a GT34UHD-TM transom-mount transducer, with mounts to support common transom installs and trolling motor installs.

Compatibility and fit

The GCV 20 is meant for boats that already have, or are being rigged with, a compatible chartplotter on the Garmin Marine Network. Plan cable runs for DC power, the marine network connection (either to a network expander or directly to a chartplotter network port), and the transducer cable to the mounting location.

Ultra High-Definition scanning is done with GT34UHD transducer models (transom-mount, thru-hull, or paired thru-hull). Hull type, deadrise, and mounting hardware requirements are driven by the transducer selection and installation style, not by the black box module.

Installation and setup

Mount the module in a dry, ventilated compartment where the status LEDs can be seen and the connectors are easy to reach. Avoid forcing connectors into ports; align the connector notch, press the connector fully into place, then hand-tighten the locking ring so it stays secure under vibration.

For power, connect to a fused 10 to 35 Vdc supply and keep the in-line fuse holder in place with a 4.0 A fast-acting mini blade fuse. When fastening into fiberglass, a small countersink through the gelcoat helps reduce the chance of cracking, and an anti-seize lubricant on stainless screws can prevent binding during installation.

On-the-water use

The supported CHIRP frequency set (260, 455, 820, and 1120 kHz) lets you balance detail and range based on conditions and how you are using the boat. Maximum depth and side range depend on the transducer, bottom type, and water conditions, with the higher frequencies typically used when you want more definition at shorter ranges.

This setup fits boats that spend time fishing structure, reefs, and channel edges, and it also works well for coastal cruising where having clearer bottom detail helps when you are learning new water.

Maintenance and care

The IPX7 rating covers incidental water exposure, but the unit should not be mounted where it can be submerged. After salty runs or washdowns, rinse the area as needed and periodically check that locking rings are snug and cables are supported to prevent chafe.

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.