Overview

The Garmin 010-12234-07 is an adapter cable that connects a GT30 transom-mount scanning transducer and an Airmar P72 or P79 traditional transducer to a compatible echoMAP chartplotter/sonar combo.

It is commonly used on boats where the transom area aerates at speed. When the transom-mounted transducer loses bottom because of cavitation, the display can continue showing water depth from the in-hull style transducer.

For a quick fit check, this harness adapts a 12-pin and an 8-pin transducer connection to a dual 4-pin sounder interface.

Key features

• Connects a Garmin GT30 transom-mount scanning transducer and an Airmar P72 or P79 traditional transducer to a compatible echoMAP chartplotter/sonar combo
• Maintains water depth from the in-hull style transducer when the transom-mounted transducer loses bottom because of cavitation
• Connector format adapts 12-pin plus 8-pin transducer connections to dual 4-pin sounder connections
• Supports a two-transducer setup without swapping plugs at the helm
• Helpful for planing hull installations where the transom can aerate while getting on plane

Compatibility and fit

This cable is intended for installations using a GT30 transom-mount scanning transducer together with an Airmar P72 or P79 traditional transducer on a compatible echoMAP unit. Match the plug style on both transducer leads and the sonar ports on the display before ordering.

If your chartplotter uses different sonar ports, or your transducer leads use a different connector family, this harness will not mate correctly.

Installation and setup

Route the cable where it will stay dry and protected, with enough slack for service loops and gentle bends. Secure it so vibration does not tug on the connectors, and keep the connectors out of bilge water and areas that see regular washdowns.

Fully seat each connector and support the cable near the plugs so the connection does not work loose over time. Keeping the run away from high-current wiring also helps prevent intermittent sonar behavior on some installs.

Use cases on board

This adapter fits setups where scanning sonar is used at idle, trolling, or drifting, while an in-hull transducer is relied on for a steadier depth number during runs. It is also a practical match when an in-hull P72 or P79 is already installed and a GT30 is being added at the transom.