GSD™ 28 Garmin depth sounder module

The GSD 28 sounder module is designed to integrate with Garmin BlueNet networks. It is also compatible with existing Garmin Marine Network devices. A Garmin BlueNet to Garmin Marine Network female-to-female adapter is included in the box to simplify connection to older systems without requiring full rewiring.

The GSD 28 depth sounder module is an evolution of the GSD 26, offering significant improvements. It is more compact horizontally than the GSD 26 while using the same mounting screw dimensions to simplify upgrades. The GSD 28 is optimized for Garmin BlueNet systems, ensuring high-speed data transmission and compatibility with future software updates via a Garmin BlueNet chartplotter.

The GSD 28 depth sounder module requires a 12 or 24 Vdc power supply. To optimize its performance, it is recommended to connect it to a 24 Vdc power system.

To connect a transducer to the GSD 28 module, follow these steps:

Remove the terminal cover of the sounder module using a #2 Phillips screwdriver. Loosen one of the cable glands and remove the rubber plug. Pass the transducer cable through the cable gland and pull it into the terminal area. If your transducer has a connector, cut the cable as close as possible to the connector, then strip approximately 90 mm (3 1/2 in) of the outer jacket and shielding, and 6 mm (1/4 in) of insulation from each inner wire. It is recommended to tin the exposed wires. Connect the bare section of each wire to the terminal block using a 3 mm flat-blade screwdriver. If the transducer has a separate external shield wire, connect it to one of the two ground posts under the terminal block. Once connections are secure, use a 24 mm (1 in) wrench to tighten the cable gland nut around the transducer cable. Tighten any unused cable glands to ensure sealing around the rubber plug. Reinstall the terminal cover.

The GSD 28 depth sounder module supports a variety of transducers. However, it is important to verify the compatibility of your specific transducer before installation. Note that the GSD 28 does not support speed wheels. For more information on selecting a compatible transducer, consult your local Garmin dealer or contact Garmin support.

The Garmin GSD™ 28 fishfinder module is an advanced black-box system designed for underwater detection. It is used for navigation and sport fishing, providing sophisticated fishfinder capabilities to visualize the seabed, structures, and fish with high clarity.

The GSD™ 28 is an evolution over the GSD 26. It offers significant improvements in connectivity, being optimized for Garmin BlueNet networks. It is also more compact horizontally than its predecessor, while using the same mounting screw dimensions to simplify upgrades.

No, the GSD™ 28 fishfinder module does not include a transducer. A transducer is required to send and receive fishfinder signals. You will need to select and purchase a compatible transducer separately, based on your specific needs and the type of fishing or sailing you engage in.

The GSD™ 28 is optimized for Garmin BlueNet systems, ensuring high-speed data transmission. It also maintains compatibility with existing Garmin Marine Network devices via the included Garmin BlueNet to Garmin Marine Network female-to-female adapter.

The GSD™ 28 supports a variety of transducers. Proper selection and installation of the transducer are essential for the device to function correctly. It is important to verify your transducer's compatibility before installation. Note that the module does not support paddlewheel speed logs.

The GSD™ 28 fishfinder module requires a 12 or 24 Vdc power supply. For optimal performance, it is recommended to connect it to a 24 Vdc system if your vessel is equipped with one.

The GSD™ 28 depth sounder module must be mounted in a location where it cannot be submerged, with adequate ventilation and protected from extreme temperatures. It is recommended to install it so that the LEDs are visible and the power and network cables can be easily connected. Ensure it is within range of your transducer cable.

To install the GSD™ 28, you will need the following tools:

A drillA 5 mm (13/64 in) drill bitA #2 Phillips screwdriverA 3 mm flathead screwdriverDielectric greaseA wire cutterA wire stripperA 24 mm (1 in) wrenchCable ties, cable glands, and marine sealant are optional but can help ensure a clean and watertight installation.

If your boat is equipped only with Garmin Marine Network devices and you do not have a Garmin BlueNet chartplotter, you must use the Garmin BlueNet to Garmin Marine Network female-to-female adapter included. This adapter allows you to connect the Garmin Marine Network cable from your previous installation (e.g., a GSD 26) to the GSD™ 28 without running a new Garmin BlueNet cable.

Yes, you can reuse two of the mounting holes from your old GSD 26, either on the right side or the left side of the mounting surface. The GSD™ 28 is horizontally more compact than the GSD 26, so you will need to drill two new holes for the opposite side. Both models use mounting screws of the same size.

Proper grounding of the GSD™ 28 is essential for signal stability. You must connect the module's ground post to the boat's water ground circuit. If your vessel does not have a designated water ground circuit, grounding to the boat's battery is an acceptable alternative.

Yes, the power cable can be extended if necessary. You must use an appropriate wire gauge based on the type of power source and the length of the extension. It is recommended to use marine-grade connectors or soldering with a waterproof heat-shrink tubing to ensure a reliable and durable connection.

To connect a transducer to the GSD™ 28, follow these steps:

Remove the terminal cover using a #2 Phillips screwdriver. Loosen one of the cable clamps and remove the rubber plug. Pass the transducer cable through the clamp. If your transducer has a connector, cut the cable near the connector before threading it through.Strip approximately 90 mm (3 1/2 in) of the outer jacket and foil shielding, and 6 mm (1/4 in) of insulation from each internal wire. Tin the stripped wires is recommended.Connect the bare section of each wire to the terminal block using a 3 mm flat-blade screwdriver, referring to the wiring diagrams and Garmin wire color charts for proper configuration.If the transducer has a separate outer shield wire, connect it to one of the two ground posts under the terminal block.Once connections are secure, tighten the clamp nut around the transducer cable with a 24 mm (1 in) wrench.Tighten any unused clamps to seal the rubber plug.Reinstall the terminal cover. Note that the sounder module will not operate if the cover is removed.

The limited warranty does not cover:

Cosmetic damage (scratches, nicks, dents).Consumable parts (unless the damage is due to a material or manufacturing defect).Damage caused by an accident, misuse, abuse, water, flooding, fire, or other natural disasters or external causes.Damage caused by service performed by a service provider not authorized by Garmin.Damage to a product modified or altered without Garmin's written authorization.Damage to a product connected to power and/or data cables not supplied by Garmin, or to non-UL-certified AC adapters and cables not labeled as Limited Power Source (LPS).