Garmin GA 38 GPS/GLONASS Antenna, IPX7, Pole/Surface/Under-Deck Mount, 10 m Cable

Overview

The Garmin GA 38 is a GPS and GLONASS antenna for boats that need a dedicated external satellite receiver feed for compatible onboard electronics. It uses a waterproof housing rated to IPX7 and a low-profile footprint that measures 91.6 mm in diameter and 49.5 mm tall, so it tucks neatly onto a cabin top, hardtop, radar arch, or similar mounting spot.

Mounting can be done on a pole, directly on a flat surface, or under a fiberglass deck (on the underside). These configurations are commonly used when the helm electronics sit inside a pilothouse, under a hardtop, or below deck and you want the GPS antenna placed where it can keep a clearer view of the sky.

Key features

• Tracks GPS and GLONASS satellites for position input to supported marine electronics.
• Waterproof housing rated to IPX7 for real-world deck spray and washdowns.
• Low-profile body: 91.6 mm diameter x 49.5 mm height.
• Mounting options for pole, surface, or under-deck installation under fiberglass.
• 10 m (32 ft) antenna cable, with connector style depending on the selected configuration.

Variants

This product is offered in multiple configurations to match different Garmin-compatible systems and housing colors.

Configurations vary by the intended device compatibility and the cable connector style (BNC-SMA or BNC-BNC), plus the external housing color. Core GA 38 function remains the same across the range: GPS and GLONASS reception in an IPX7-rated, low-profile antenna housing.

• 010-13305-20: Compatibility for Cortex V1 & M1, color Black. This version is matched to Cortex installations that use the BNC-SMA cable connection, with a black housing for a consistent look on deck.
• 010-13305-00: Compatibility for Cortex V1 & M1, color White. This version is matched to Cortex installations that use the BNC-SMA cable connection, with a white housing that blends into light-colored topsides.
• 010-12017-30: Compatibility for Garmin VHF, AIS & Chartplotters, color Black. This version is intended for compatible Garmin systems that use a BNC-BNC external antenna connection, with a black housing for darker mounting surfaces.
• 010-12017-00: Compatibility for Garmin VHF, AIS & Chartplotters, color White. This version is intended for compatible Garmin systems that use a BNC-BNC external antenna connection, with a white housing for lighter mounting surfaces.

Installation and setup

For best results, mount the antenna where it has the most open view of the sky and where it is less likely to be shaded by masts, hardtop supports, antennas, or radar structures. If you route the cable through a deck or hardtop, seal the pass-through properly and leave a small drip loop so water does not track down the cable into the interior.

Under-deck mounting is intended for the underside of fiberglass decks. Avoid placing it under metal structures or dense equipment areas that can block satellite reception.

Compatibility and fit

Before ordering, confirm which connection your system expects. Cortex V1 and M1 installations use the GA 38 configuration with a BNC-SMA cable, while compatible Garmin VHF, AIS, and chartplotter setups use the GA 38 configuration with a BNC-BNC cable. Housing color is a cosmetic choice and does not change the antenna function.

Use cases on board

This antenna is a solid fit for cruising and fishing boats where the main electronics are mounted inside the helm and you want the GPS antenna outside for steadier reception. It also suits refits where an older external GPS antenna is being replaced and you want a clean, low-profile footprint on deck.

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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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