{"product_id":"garmin-gt12m-thf-sonde-traversante-20-degres","title":"GT12M-THF 20° Through-Hull CHIRP Mid-Frequency Sonde","description":"\u003cp\u003e\n    The \u003cstrong\u003eGarmin GT12M-THF 20-degree through-hull sonar\u003c\/strong\u003e is a technical solution for recreational sailors and racers seeking accurate sonar data for navigation. Made of brass, this transducer is specifically designed for installation in fiberglass, wood, or composite hulls, with a 20-degree correction angle to adapt to hulls with a deadrise angle of 17 to 24 degrees. It ensures optimal compatibility with modern Garmin fishfinders and chartplotters, requiring a software update on the display for maximum performance.\n\u003c\/p\u003e\n\n\u003ch3\u003ePositioning and Compatibility\u003c\/h3\u003e\n\u003cp\u003e\n    The GT12M-THF model differs from the GT15M-THF, which is made of stainless steel and includes galvanic isolation components for aluminum or steel hulls. The brass GT12M-THF version is mandatory for non-metallic hulls to prevent galvanic corrosion. Its through-hull design ensures a flush installation to minimize drag and optimize sonar signal quality in non-turbulent waters. Selecting a transducer with the appropriate deadrise angle is critical for accurate readings, with the GT12M-THF 20 degrees being ideal for angles between 17 and 24 degrees.\n\u003c\/p\u003e\n\n\u003ch3\u003eInstallation and Integration\u003c\/h3\u003e\n\u003cp\u003e\n    Installing the GT12M-THF through-hull transducer requires careful attention, including drilling a 73 mm (2 7\/8 in) hole for fiberglass or composite hulls. Marine sealant is essential to ensure a watertight fit. The transducer must be positioned away from propellers, keels, and any turbulence sources to guarantee optimal performance. Garmin recommends having the installation performed by a qualified marine technician to preserve hull integrity and system reliability.\n\u003c\/p\u003e","brand":"Garmin","offers":[{"title":"20 degrees","offer_id":55860431061332,"sku":"010-02867-02","price":283.33,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/main_7062bc35-8955-4fae-b3f7-43103a6eee9e.jpg?v=1779193301","url":"https:\/\/skysat.fr\/en-gb\/products\/garmin-gt12m-thf-through-hull-sonde-20-degrees","provider":"Skysat","version":"1.0","type":"link"}