GST™ 43 Through-Hull Transducer + GST™ 10

This kit measures and transmits two essential data points: speed through water (STW) and water temperature. Speed is measured with an accuracy of ±1 %, and depending on the transducer type, it can reach up to 90 knots.

Installing the GST 43 through-hull transducer requires a 43 mm (1 11/16 inches) hole in the hull. For sandwich hulls (cored fiberglass), an additional 52 to 55 mm hole may be needed to prepare the core.

Yes, absolutely. The GST 43 transducer connects to the NMEA 2000 network via the GST 10 adapter. The kit includes a drop cable and a T-connector for direct integration. Once connected, the GST 10 appears as a device in the NMEA 2000 equipment list on Garmin, GMI, or GNX chartplotters.

Yes, the GST 43 can be wired directly to a legacy Nexus network. Simply cut the transducer cable to the required length and connect the wires following the provided color code: green to green, yellow to yellow, white to white, and the shield to the shield. The blue wire is not used.

The GST 10 supports essential PGNs for navigation: PGN 128259 (Speed: Water reference) for speed through water and PGN 130312 (Temperature) for water temperature. It also supports network management PGNs such as ISO acknowledgment (59392), ISO request (59904), and ISO address claim (60928).

The GST 43 transducer cable is 6 meters (19.7 feet) long. This provides sufficient flexibility to route the transducer from its mounting location to the GST 10 adapter or the onboard network.

Power consumption is very low. The GST 43 transducer consumes 0.06 W at 12 Vdc. The GST 10 adapter has a maximum consumption of 0.9 W. The system is therefore very energy-efficient.

The GST 43 depth sounder operates within a temperature range of -10 °C to 70 °C (-14 °F to 158 °F). For storage, the range is extended from -35 °C to 70 °C (-31 °F to 158 °F).

Yes, the GST 10 adapter has an IPX7 protection rating per IEC 60529. This means it can withstand temporary immersion in water up to 1 meter deep for 30 minutes.

For optimal performance, the transducer must be installed in an area of clean, non-turbulent water. On keel sailboats, mount it more than 25 cm and less than 75 cm ahead of the keel. On powerboats, avoid installing it near sharp chines. Ensure it is parallel to the boat’s fore-aft axis and not in the propeller wash.

Required tools include: a drill, a 43 mm hole saw, marine sealant, silicone grease, a cable cutter, and for sandwich hulls, a 52–55 mm hole saw, resin, fiberglass cloth or casting epoxy. A 43 mm cylinder to seal the core is also recommended.

Temperature calibration is performed using a Garmin device connected to the NMEA 2000 network. On a chartplotter, go to Settings > Communications > NMEA 2000 Configuration > Device List. Select the GST 10, then choose Review or Configure and finally Temp. Offset. Enter a positive value if the sensor measures a temperature colder than the actual temperature, or a negative value if it measures warmer.

Yes, because the GST 43 is a standard NMEA 2000 device. It can therefore be recognized by any NMEA 2000-compatible display or chartplotter, provided it supports PGN 128259 (speed) and 130312 (temperature). However, for optimal configuration and easy calibration, use with a Garmin device is recommended.

The recommended safe distance from a compass is 5 cm (2 inches). It is important to respect this distance to avoid any magnetic interference with the boat's compass.

Yes, the kit includes a drop cable and a T-connector to link the GST 10 to an existing NMEA 2000 network. You do not need to purchase these accessories separately.

Yes, this is entirely possible. This kit is designed as a replacement or upgrade solution. If your old transducer used a 43 mm drilling pattern, installation is straightforward. Otherwise, you may need to adapt the hole. Ensure your onboard network (NMEA 2000 or Nexus) is compatible.

The GST 10 adapter operates with an input voltage range of 9 to 16 Vdc. It is therefore compatible with most 12 V electrical systems on boats.

Yes, the kit is supplied with a plastic plug that fits into the through-hull fitting. Garmin recommends keeping this plug for use when cleaning or servicing the transducer, or to protect the hole when the transducer is removed.