Overview

The Garmin 010-02797-00 is a GSD 28 sonar module that adds dual-channel CHIRP traditional sonar to compatible Garmin chartplotters over the Garmin BlueNet marine network. Output is 300 W to 3 kW RMS (transducer dependent), with CHIRP support from 33 to 250 kHz and a listed maximum depth up to 10,000 ft (3,048 m) when paired with the right transducer.

It runs on 10 to 32 V DC, draws up to 120 W, and uses a 15 A fuse. The enclosure is IPX7-rated and measures 10.7 in x 14.4 in x 4.0 in, so it is straightforward to plan for space, wiring clearance, and airflow in a console, electronics locker, or other protected compartment.

Key features

• Dual-channel CHIRP sonar module with 300 W to 3 kW RMS transmit power (transducer dependent)
• CHIRP operating range from 33 to 250 kHz and maximum depth up to 10,000 ft (3,048 m) (transducer dependent)
• Two bare-wire sonar connections for wiring transducers to the low and high channels
• RapidReturn and xCHIRP processing for faster screen updates and clearer target separation on supported setups
• One Garmin BlueNet network port for integration with compatible Garmin chartplotters and network switches
• IPX7 water rating with a fully gasketed housing for spray and washdown environments
• 10 to 32 V DC input, up to 120 W draw, protected by a 15 A fuse

Compatibility and fit

A transducer is required, and the module supports a wide range of Garmin and AIRMAR transducers (sold separately). It also works well for retrofits where the boat already has a bare-wire transducer, since the sonar connections are made at the internal terminal block and can be configured from a networked chartplotter.

This unit does not support water speed wheels, so any paddlewheel speed input should remain on a separate sensor or instrument interface.

Installation and setup

Plan the mounting location so the module cannot be submerged and has ventilation. Leave enough clearance to access the power and network connections and to route the transducer cable cleanly without tight bends or strain.

If you are replacing a GSD 26, the GSD 28 is horizontally smaller and uses the same size mounting screws. In many upgrades, two existing mounting holes can be reused on one side while the opposite side is re-drilled to match the new footprint.

The sonar module does not operate with the terminal block lid removed, and unused cord grips should remain plugged and tightened to help keep moisture out of the wiring area.

Electrical and network integration

Power is 10 to 32 V DC, which covers both 12 V and 24 V systems. On boats with both available, connecting to 24 V DC is preferred for best performance. Keep the in-line 15 A fuse in place and use proper marine wiring practices for any power-cable extension.

Network connection is through a Garmin BlueNet port. On Garmin BlueNet systems, connect to an open BlueNet port on a chartplotter or a BlueNet switch. On mixed or legacy Garmin Marine Network installs, the supplied legacy adapter hardware helps bridge existing network cabling without re-running the entire boat.

Use on board

This module is a strong fit for boats that spend time in deeper water and want traditional sonar returns that refresh quickly, such as offshore sportfishing boats running canyon edges, deep drops, or bait schools. In rougher seas, pairing it with an MSC 10 external satellite compass (sold separately) enables heave compensation to reduce wave and swell effects on returns.

What’s included

• GSD 28 sonar module
• Power cable
• Garmin BlueNet marine network cable (6 ft) with legacy network adapter
• Field installable adapter kit for the Garmin BlueNet network
• Mounting hardware
• Documentation