{"product_id":"garmin-gt21-tm","title":"Garmin GT21-TM","description":"\u003cp\u003eThis aft mirror mount transducer provides extremely clear probe images of objects, structures and fish that are under your boat. This transducer with traditional probe and CHIRP DownVü is optimized to offer maximum performance at great depths and in rough sea conditions.\u003c\/p\u003e\n\u003cp\u003eThe CHIRP DownVü element has a power of 500 W and operating frequencies of 260\/455 kHz. The traditional probe has a power of 600 W and operating frequencies of 50\/200 kHz. It also has a built-in quick-response temperature sensor.\u003c\/p\u003e\n\u003cp\u003eGT21-TM includes an 8-pin transducer with assembly components and installation instructions. Follow the instructions carefully to avoid damage to the boat.\u003c\/p\u003e\n\u003ch3\u003eSpecifications:\u003c\/h3\u003e\n\u003ctable class=\"app__product__specs__container__group\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth class=\"specs-group narrow-column\"\u003ePhysical And Performance Characteristics\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"narrow-column\"\u003eFrequency\u003c\/td\u003e\n\u003ctd class=\"wide-column\"\u003eTraditional 50\/200; ClearVü CHIRP 260 kHz (245-275 kHz) \u0026amp; 455 kHz (445-465 kHz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"narrow-column\"\u003eEnergy\u003c\/td\u003e\n\u003ctd class=\"wide-column\"\u003eTraditional 600 W; ClearVü 500 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"narrow-column\"\u003eBeam Width\u003c\/td\u003e\n\u003ctd class=\"wide-column\"\u003eTraditional: 40°\/10°\u003cbr\u003e\nClearVü: 2.0°x51° @ 260 kHz and 1.4°x29° @ 455 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"narrow-column\"\u003eMaximum Depth\u003c\/td\u003e\n\u003ctd class=\"wide-column\"\u003eTraditional: 1,500 ft.; ClearVü: 1,000 ft.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"narrow-column\"\u003eCable Length\u003c\/td\u003e\n\u003ctd class=\"wide-column\"\u003e30 ft.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"narrow-column\"\u003eDEPTH\/SPEED\/TEMPERATURE\u003c\/td\u003e\n\u003ctd class=\"wide-column\"\u003eDepth and Temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"narrow-column\"\u003eNumber of Sideburns\u003c\/td\u003e\n\u003ctd class=\"wide-column\"\u003e8-pin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"narrow-column\"\u003eAft Mirror Angles Allowed\u003c\/td\u003e\n\u003ctd class=\"wide-column\"\u003e0°-70° degree transom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\u003c!-- sr-faq v=1 vendor=garmin source_sha256=e84f15abab86f00d09ddad164f9a630e4f21d449566993c83e4e58125db31764 --\u003e\u003ch4\u003eFAQs\u003c\/h4\u003e\u003cdetails\u003e\u003csummary\u003eWill the GT21-TM transducer work with boats having an inboard engine?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eTransom mount transducers will not work on vessels with an inboard engine, as mentioned in Garmin's installation guidance.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat safety precautions should be followed during installation?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eFollow the included installation instructions carefully to avoid damage to your boat when installing the transducer.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWho should install the GT21-TM if I encounter difficulties?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eIf installation is difficult, contact Garmin Product Support or seek the advice of a professional installer.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWho should be contacted if I experience installation issues with GT21-TM?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eIf you experience difficulty during installation, contact Garmin Product Support or seek a professional installer's advice.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow should a transom mount transducer like the GT21-TM be mounted?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eTransom mount transducers are attached to the back (transom) of the boat hull and are easy to install and remove, especially if a kick-up bracket is used. They are good for trailered boats and perform well at boat speeds below 30 knots (34 mph).\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow should I position the GT21-TM for best sonar performance?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eInstall transducers according to the included instructions for best performance. If you have issues, contact Garmin support or a professional installer.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eCan the transducer be serviced in-water?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eTransom mount units can be installed and serviced more easily than some other types, but in-hull models are notable for this feature.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eDoes the GT21-TM require the hull to be drilled for mounting?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eTransom mount types attach to the back of the hull, typically requiring drilling. Thru-hull types, however, require a hole through the hull.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eIs the GT21-TM compatible with stepped hull designs?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eTransom mount transducers will not work on stepped hulls, per Garmin recommendations.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eIs the GT21-TM suitable for use on sailboats?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eTransom mount transducers are not recommended for sailboats because of excessive heeling, which can affect performance.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Will the GT21-TM transducer work with boats having an inboard engine?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Transom mount transducers will not work on vessels with an inboard engine, as mentioned in Garmin's installation guidance.\"}}, {\"@type\": \"Question\", \"name\": \"What safety precautions should be followed during installation?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Follow the included installation instructions carefully to avoid damage to your boat when installing the transducer.\"}}, {\"@type\": \"Question\", \"name\": \"Who should install the GT21-TM if I encounter difficulties?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"If installation is difficult, contact Garmin Product Support or seek the advice of a professional installer.\"}}, {\"@type\": \"Question\", \"name\": \"Who should be contacted if I experience installation issues with GT21-TM?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"If you experience difficulty during installation, contact Garmin Product Support or seek a professional installer's advice.\"}}, {\"@type\": \"Question\", \"name\": \"How should a transom mount transducer like the GT21-TM be mounted?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Transom mount transducers are attached to the back (transom) of the boat hull and are easy to install and remove, especially if a kick-up bracket is used. They are good for trailered boats and perform well at boat speeds below 30 knots (34 mph).\"}}, {\"@type\": \"Question\", \"name\": \"How should I position the GT21-TM for best sonar performance?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Install transducers according to the included instructions for best performance. If you have issues, contact Garmin support or a professional installer.\"}}, {\"@type\": \"Question\", \"name\": \"Can the transducer be serviced in-water?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Transom mount units can be installed and serviced more easily than some other types, but in-hull models are notable for this feature.\"}}, {\"@type\": \"Question\", \"name\": \"Does the GT21-TM require the hull to be drilled for mounting?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Transom mount types attach to the back of the hull, typically requiring drilling. 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